text:
\section{Introduction}

	This article is an english translation of \cite{MSV}, where some more details can be found.

 Let $P(n)$ be the set of all posets with $n$ elements and   $NIP(n)$ the set of non-isomorphic posets with $n$ elements. It is a long-standing combinatorial problem to determine the numbers $|P(n)|$ and $|NIP(n)|$.\\
No simple explicit  or recursive formula for $|P(n)|,(|NIP(n)|)$ has been found yet.
The numbers determined so far are $|P(n)|$,  $1\leq n\leq 18$ and $|NIP(n)|$,  $1\leq n\leq 16$, see \cite{BG}, \cite{CL3}, \cite{CSD}, \cite{KV}, \cite{SA}, \cite{SH1}, \cite{EHL}, \cite{EM1}, \cite{EM2, EM3}, \cite{DS}, \cite{BVDR}, \cite{BBR}, \cite{RVI1}, \cite{RVI2}, \cite{RRA}, \cite{CR}, \cite{EM5}, \cite{EM6}, \cite{HR}, \cite{BM}.

 Let  $P^{(j)}(n)$, $1\leq j\leq 2^n,$ be the number of all posets with $n$ elements possessing exactly $j$ antichains. Note that $P^{(j)}(n)=0$, $1\leq j\leq n$, then  $|P(n)|=\sum\limits_{j=n+1}^{2^n} P^{(j)}(n)$. For the determination of the number of antichians of a poset $X$ we use some results of L. Monteiro \cite{ML} (section 3). S. K. Das \cite{DS} has found, with the help of a shopisticated computer program (see \cite{EM4}, page 128) $|P(n)|$, for $n\leq 11$, in particular:
$$ |P(10)|=6{.}611{.}065{.}248{.}783.$$
Note that, M. Ern\'e \cite{EM4} determines in $|P(n)|$, $1\leq n\leq 9$ without the aid of any computer program. We have determined the numbers $P^{(j)}(7),$ $1\leq j\leq 128$ (see in the following the  Hasse diagrams of all the non-isomorphic posets of $P(7)$), and
using a result of M. Ern\'e \cite{EM4} (Theorem 2.4, page 123), we compute $|P(10)|$ without the aid of any computer program.

\section{Hasse diagrams}
\noindent In the Hasse diagrams below, for each poset $X$ we indicate in boldface the number of antichains of $X$ and under each one of them we indicate the number of posets which are isomorphic to $X$.\\[2mm]
For $n=2,3,4$ the Hasse diagrams are well known.

\noindent ${\bf NIP(2)}$

$$
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$$
\medskip

\noindent ${\bf NIP(3)}$

$$
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\put {$ \scriptstyle \bullet$} [c] at  8 2
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\put{$1$} [c] at 8 0
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$$

\noindent ${\bf NIP(4)}$

$$
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\put {$ \scriptstyle \bullet$} [c] at 10 2
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$$
$$
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$$
$$
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\medskip

\noindent ${\bf NIP(5)}$

$$
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$$

$$
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$$
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\put{$60$} [c] at 8 0
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{58)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 5.5 10
\put {$ \scriptstyle \bullet$} [c] at 7 10
\put {$ \scriptstyle \bullet$} [c] at 8.5 10
\put {$ \scriptstyle \bullet$} [c] at 7 2
\put {$ \scriptstyle \bullet$} [c] at 10  2
\setlinear \plot  5.5 10   7 2  8.5 10     /
\setlinear \plot   7 2 7 10     /
\put{$20$} [c] at 8 0
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{59)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 5.5 2
\put {$ \scriptstyle \bullet$} [c] at 7 2
\put {$ \scriptstyle \bullet$} [c] at 8.5 2
\put {$ \scriptstyle \bullet$} [c] at 7 10
\put {$ \scriptstyle \bullet$} [c] at 10  2
\setlinear \plot  5.5 2   7 10  8.5 2     /
\setlinear \plot   7 2 7 10     /
\put{$20$} [c] at 8 0
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{\bf 20} [l] at 0 13
\put{60)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 6 10
\put {$ \scriptstyle \bullet$} [c] at 7 2
\put {$ \scriptstyle \bullet$} [c] at 8 10
\put {$ \scriptstyle \bullet$} [c] at 9 2
\put {$ \scriptstyle \bullet$} [c] at 11  2
\setlinear \plot  6 10   7 2 8 10     /
\put{$30$} [c] at 8 0
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{61)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 6 2
\put {$ \scriptstyle \bullet$} [c] at 10  2
\put {$ \scriptstyle \bullet$} [c] at 7 10
\put {$ \scriptstyle \bullet$} [c] at 8 2
\put {$ \scriptstyle \bullet$} [c] at 10 2
\setlinear \plot  6 2   7 10 8 2     /
\put{$30$} [c] at 8 0
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{\bf 24} [l] at 0 13
\put{62)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 6 10
\put {$ \scriptstyle \bullet$} [c] at 6 2
\put {$ \scriptstyle \bullet$} [c] at 8 2
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 12  2
\setlinear \plot  6 2   6 10     /
\put{$20$} [c] at 8 0
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from 0 to 13
\put{\bf 32} [l] at 0 13
\put{63)} [l] at 0 10
\put {$ \scriptstyle \bullet$} [c] at 6 2
\put {$ \scriptstyle \bullet$} [c] at 8 2
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 12 2
\put {$ \scriptstyle \bullet$} [c] at 14  2
\put{$1$} [c] at 10 0
\endpicture
\end{minipage}
$$

\noindent ${\bf NIP(6)}$
\medskip

$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{\bf 7} [l] at 0 15
\put{1)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 12 2.4
\put {$ \scriptstyle \bullet$} [c] at 12 4.8
\put {$ \scriptstyle \bullet$} [c] at 12 7.2
\put {$ \scriptstyle \bullet$} [c] at 12 9.6
\put {$ \scriptstyle \bullet$} [c] at 12  12
\setlinear \plot  12 0   12 12     /
\put{$720$} [c] at 12 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{\bf 8} [l] at 0 15
\put{2)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 10 3
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 6 9
\put {$ \scriptstyle \bullet$} [c] at 14 9
\setlinear \plot  10 0 10 6  6 9 10 12 14 9 10  6     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{3)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 9
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 6 3
\put {$ \scriptstyle \bullet$} [c] at 14 3
\setlinear \plot  10 12 10 6  6 3 10 0 14 3 10  6     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{4)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 10 4
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot  10 0 10 6  6 12      /
\setlinear \plot  10 6  14 12      /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{5)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 10 8
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot  6 0  10 6  10 12      /
\setlinear \plot  10 6  14 0      /
\put{$360$} [c] at 10 -2

\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{6)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 6  6
\put {$ \scriptstyle \bullet$} [c] at 14 6
\setlinear \plot  10 0 10 2 6 6 10  10  10 12     /
\setlinear \plot  10 10   14 6 10 2      /
\put{$360$} [c] at 8 -2
\endpicture
\end{minipage}
$$

$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{\bf 9} [l] at 0 15
\put{7)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 10  4
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 8
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot  10 0  10 4  6 12      /
\setlinear \plot  10 4  14 12      /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{8)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 10 8
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 4
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot  10 12  10 8  6 0      /
\setlinear \plot  10 8  14 0      /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{9)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 8
\put {$ \scriptstyle \bullet$} [c] at 6 4
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 14 4
\put {$ \scriptstyle \bullet$} [c] at 8 6
\setlinear \plot   10 12 10 8 6 4 10 0 14 4 10 8     /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{10)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 4
\put {$ \scriptstyle \bullet$} [c] at 6 8
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 14 8
\put {$ \scriptstyle \bullet$} [c] at 8 10
\setlinear \plot    10 0 10 4 6 8 10 12 14 8  10 4     /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{11)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 4
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 6 8
\put {$ \scriptstyle \bullet$} [c] at 14 12
\put {$ \scriptstyle \bullet$} [c] at 14 8
\setlinear \plot    10 0 10 4 6 8 6 12 14 8 14 12 6 8  /
\setlinear \plot    10 4 14 8 /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{12)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10  8
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 4
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 4
\setlinear \plot    10 12 10 8 6 4 6 0 14 4 14 0 6 4  /
\setlinear \plot    10 8 14 4 /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{13)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 6 5
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 5
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot  10 0  6 5 10  10  14  12      /
\setlinear \plot  10 0  14 5 10 10 6 12      /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{14)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 6 7
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 14 7
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot  10 12  6 7 10 2  14  0      /
\setlinear \plot  10 12  14 7 10 2 6 0      /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{15)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 4
\put {$ \scriptstyle \bullet$} [c] at 6 8
\put {$ \scriptstyle \bullet$} [c] at 14 4
\put {$ \scriptstyle \bullet$} [c] at 14 8
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\setlinear \plot 6 8 14 4  10 0  6 4 14  8 10 12  6 8 6 4  14 8   14 4 /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{16)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 4
\put {$ \scriptstyle \bullet$} [c] at 10 8
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot   6 0 10 4 10 8 6 12     /
\setlinear \plot   10 8 14 12     /
\setlinear \plot   14 0 10 4     /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{\bf 10} [l] at 0 15
\put{17)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 7.15 9
\put {$ \scriptstyle \bullet$} [c] at 8.35 6
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot    10 0 10 2  6 12  /
\setlinear \plot    10 2 14 12 /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{18)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 7.15 3
\put {$ \scriptstyle \bullet$} [c] at 8.35 6
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot    10 12 10 10  6 0  /
\setlinear \plot    10 10 14 0 /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{19)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 7
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 2
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 14 7
\setlinear \plot  10 0  10 2 6 7  10 12  14  7 10 2     /
\setlinear \plot  6 7 6 12 /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{20)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 5
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 10
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 14 5
\setlinear \plot  10 12  10 10 6 5  10 0  14  5 10 10     /
\setlinear \plot  6 5 6 0 /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{21)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 6 6
\put {$ \scriptstyle \bullet$} [c] at 14 6
\put {$ \scriptstyle \bullet$} [c] at 8 3
\put {$ \scriptstyle \bullet$} [c] at 12 9
\setlinear \plot  10 0  6 6 10 12  14  6 10 0     /
\setlinear \plot  8 3 12 9 /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{22)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 6 4
\put {$ \scriptstyle \bullet$} [c] at 6 6
\put {$ \scriptstyle \bullet$} [c] at 6 8
\put {$ \scriptstyle \bullet$} [c] at 14 6
\setlinear \plot    10 0 6 4 6 8 10 12 14 6 10 0  /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{23)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 8 9
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot    6 0 14  12 /
\setlinear \plot    6 12 14 0 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{24)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 6
\put {$ \scriptstyle \bullet$} [c] at 8 3
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot    6 0 14  12 /
\setlinear \plot    6 12 14 0 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
$$

$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{25)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 6 2
\put {$ \scriptstyle \bullet$} [c] at 6 7
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 2
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot    6 12 6 2  10 0 14 2 14 12 6 2 /
\setlinear \plot    6 7 14 2 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{26)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 6 10
\put {$ \scriptstyle \bullet$} [c] at 6 5
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 14 10
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot    6 0 6 10  10 12 14 10 14 0 6 10 /
\setlinear \plot    6 5 14 10 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{27)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 8 4
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 6 8
\put {$ \scriptstyle \bullet$} [c] at 14 12
\put {$ \scriptstyle \bullet$} [c] at 14 8
\setlinear \plot    10 0 6 8 6 12 14 8 14 12 6 8  /
\setlinear \plot    10 0 14 8 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{28)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 8 8
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 4
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 4
\setlinear \plot    10 12 6 4 6 0 14 4 14 0 6 4  /
\setlinear \plot    10 12 14 4 /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{29)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 6
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 14 6
\put {$ \scriptstyle \bullet$} [c] at 14 12
\setlinear \plot    6 12 6 0 14 6  6 12  /
\setlinear \plot    14 12 14 0 6 6 14 12 /
\put{$90$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{\bf 11} [l] at 0 15
\put{30)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 14 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 7.2 8.5
\put {$ \scriptstyle \bullet$} [c] at 8.2 5.5
\put {$ \scriptstyle \bullet$} [c] at 9 2.8
\setlinear \plot  6 12  10 0 14 12      /
\put{$720$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{31)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
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\setlinear \plot 6 0 10 12 14  0 14 12  /
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\setlinear \plot 6 12 9 0 12 12     /
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\put{294)} [l] at 0 12
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\put {$ \scriptstyle \bullet$} [c] at 12 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
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\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 12 6 0 9 12 12 0 12 12    /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
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\put{295)} [l] at 0 12
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\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 6 12 9 0 12 12 12 0    /
\put{$360$} [c] at 10 -2
\endpicture
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\setlinear \plot 6 12 8 0 10 12    /
\setlinear \plot 8  0 8 12     /
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\put{$120$} [c] at 10 -2
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\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 8 12 10 0    /
\setlinear \plot 8  0 8 12     /
\setlinear \plot 14  0 14 12     /
\put{$120$} [c] at 10 -2
\endpicture
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\put{298)} [l] at 0 12
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\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 14 12
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 6 12   /
\setlinear \plot 10 0 10 12   /
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\put{$120$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  28}$} [l] at 0 15

\put{299)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 12 8 0 10 12 10 0   /
\setlinear \plot 8  0 8 12     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{300)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 8 12 10 0 10 12   /
\setlinear \plot 8  0 8 12     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{301)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 7 6
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 12 8 0 10 12    /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{302)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 7 6
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 8 12 10 0    /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{303)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 6 12 10 0 10 12 6 0   /
\put{$90$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  30}$} [l] at 0 15

\put{304)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 8 12 10 0    /
\setlinear \plot 12  0 12 12     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{305)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 12 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 12 8 0 10 12    /
\setlinear \plot 12  0 12 12     /
\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  32}$} [l] at 0 15

\put{306)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 12 6 0 10 12 10 0    /

\put{$360$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{307)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 6
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\setlinear \plot 6 0 6 12      /
\put{$120$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  33}$} [l] at 0 15

\put{308)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 12 12
\put {$ \scriptstyle \bullet$} [c] at 14 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\setlinear \plot 6 12 10 0 14 12     /
\setlinear \plot 8 12 10 0 12 12     /
\setlinear \plot 10 0 10 12     /

\put{$6$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{309)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 10 12
\setlinear \plot 6 0 10 12 14 0     /
\setlinear \plot 8 0 10 12 12 0     /
\setlinear \plot 10 0 10 12     /
\put{$6$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  34}$} [l] at 0 15

\put{310)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 12 12
\put {$ \scriptstyle \bullet$} [c] at 9 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 12 9 0 12 12     /
\setlinear \plot 8 12 9 0 10 12     /
\put{$30$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{311)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 9 12
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 0 9 12 12 0     /
\setlinear \plot 8 0 9 12 10 0     /
\put{$30$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  36}$} [l] at 0 15

\put{312)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 9 12
\put {$ \scriptstyle \bullet$} [c] at 9 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 0 6 12     /
\setlinear \plot 9 0 9 12     /
\put{$180$} [c] at 10 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{313)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 12 8 0 10  12     /
\setlinear \plot  8 0 8  12     /
\put{$60$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{314)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 0 8 12 10  0     /
\setlinear \plot  8 0 8  12     /
\put{$60$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  40}$} [l] at 0 15
\put{315)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 7 0
\put {$ \scriptstyle \bullet$} [c] at 8 12
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 12 7 0 8 12     /
\put{$60$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{316)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 7 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 0 7 12 8 0     /
\put{$60$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  48}$} [l] at 0 15

\put{317)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 6 12
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14  0
\setlinear \plot 6 0 6 12     /
\put{$30$} [c] at 10 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{ ${\bf  64}$} [l] at 0 15
\put{318)} [l] at 0 12
\put {$ \scriptstyle \bullet$} [c] at 6 0
\put {$ \scriptstyle \bullet$} [c] at 8 0
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 14 0
\put {$ \scriptstyle \bullet$} [c] at 16 0
\put{$1$} [c] at 11 -2
\endpicture
\end{minipage}
$$
\newpage

\noindent  ${\bf  NIP(7)}$

$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{${\bf  8}$} [l] at 2 15
\put{1)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 12 0
\put {$ \scriptstyle \bullet$} [c] at 12 2
\put {$ \scriptstyle \bullet$} [c] at 12 4
\put {$ \scriptstyle \bullet$} [c] at 12 6
\put {$ \scriptstyle \bullet$} [c] at 12 8
\put {$ \scriptstyle \bullet$} [c] at 12 10
\put {$ \scriptstyle \bullet$} [c] at 12  12
\setlinear \plot  12 0   12 12     /
\put{$5{.}040$} [c] at 12 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{${\bf  9}$} [l] at 2 15

\put{2)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 0
\put {$ \scriptstyle \bullet$} [c] at 13 2
\put {$ \scriptstyle \bullet$} [c] at 13 4
\put {$ \scriptstyle \bullet$} [c] at 13 6
\put {$ \scriptstyle \bullet$} [c] at 10 9
\put {$ \scriptstyle \bullet$} [c] at 16 9
\put {$ \scriptstyle \bullet$} [c] at 13 12
\setlinear \plot  13 0 13 6  10 9 13 12 16 9 13  6     /
\put{$2{.}520$} [c] at 13 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{3)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 0
\put {$ \scriptstyle \bullet$} [c] at 10 3
\put {$ \scriptstyle \bullet$} [c] at 16 3
\put {$ \scriptstyle \bullet$} [c] at 13 6
\put {$ \scriptstyle \bullet$} [c] at 13 8
\put {$ \scriptstyle \bullet$} [c] at 13 10
\put {$ \scriptstyle \bullet$} [c] at 13 12
\setlinear \plot  13 12 13 6  10 3 13 0 16 3 13  6     /
\put{$2{.}520$} [c] at 13 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{4)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 0
\put {$ \scriptstyle \bullet$} [c] at 13 2
\put {$ \scriptstyle \bullet$} [c] at 13 4
\put {$ \scriptstyle \bullet$} [c] at 10 7
\put {$ \scriptstyle \bullet$} [c] at 16 7
\put {$ \scriptstyle \bullet$} [c] at 13 10
\put {$ \scriptstyle \bullet$} [c] at 13 12
\setlinear \plot  13 0 13 4 10 7 13 10 13 12    /
\setlinear \plot  13 4 16 7 13 10  /
\put{$2{.}520$} [c] at 13 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{5)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 0
\put {$ \scriptstyle \bullet$} [c] at 13 2
\put {$ \scriptstyle \bullet$} [c] at 10 5
\put {$ \scriptstyle \bullet$} [c] at 16 5
\put {$ \scriptstyle \bullet$} [c] at 13 8
\put {$ \scriptstyle \bullet$} [c] at 13 10
\put {$ \scriptstyle \bullet$} [c] at 13 12
\setlinear \plot  13 0 13 2 10 5 13 8 13 12    /
\setlinear \plot  13 2 16 5 13 8  /
\put{$2{.}520$} [c] at 13 -2
\endpicture
\end{minipage}
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{6)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 0
\put {$ \scriptstyle \bullet$} [c] at 13 2
\put {$ \scriptstyle \bullet$} [c] at 13 4
\put {$ \scriptstyle \bullet$} [c] at 13 6
\put {$ \scriptstyle \bullet$} [c] at 13 8
\put {$ \scriptstyle \bullet$} [c] at 10 12
\put {$ \scriptstyle \bullet$} [c] at 16 12
\setlinear \plot  13 0 13 8  10 12      /
\setlinear \plot  13 8  16 12      /
\put{$2{.}520$} [c] at 13 -2
\endpicture
\end{minipage}
$$
$$
\begin{minipage}{4cm}
\beginpicture
\setcoordinatesystem units   <1.5mm,2mm>
\setplotarea x from 0 to 16, y from -2 to 15
\put{7)} [l] at 2 12
\put {$ \scriptstyle \bullet$} [c] at 13 12
\put {$ \scriptstyle \bullet$} [c] at 13 10
\put {$ \scriptstyle \bullet$} [c] at 13 8
\put {$ \scriptstyle \bullet$} [c] at 13 6
\put {$ \scriptstyle \bullet$} [c] at 13 4
\put {$ \scriptstyle \bullet$} [c] at 10 0
\put {$ \scriptstyle \bullet$} [c] at 16 0
\setlinear \plot  13 12 13 4  10 0      /
\setlinear \plot  16 0  13 4     /
\put{$2{.}520$} [c] at 13 -2
\endpicture
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\begin{center}
\begin{tabular}{||r||r|r|r|r|r||}\hline\hline
\multicolumn{1}{||r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}\\
\multicolumn{1}{||r||}{$j$}&\multicolumn{1}{r|}{$P^{(j)}(1)$}&\multicolumn{1}{r|}{$P^{(j)}(2)$}&\multicolumn{1}{r|}{$P^{(j)}(3)$}&\multicolumn{1}{r|}{$P^{(j)}(4)$}&\multicolumn{1}{r||}{$P^{(j)}(5)$}\\\hline\hline
1&$0$&$0$&$0$&$0$&$0$\\\hline
2&$1$&$0$&$0$&$0$&$0$\\\hline
3&   &$2$&$0$&$0$&$0$\\\hline
4&   &$1$&$6$&$0$&$0$\\\hline
5&   &&$6$&$24$&$0$\\\hline
6&   &&$6$&$36$&$120$\\\hline
7&   &&$0$&$54$&$240$\\\hline
8&   &&$1$&$48$&$450$\\\hline
9&   &&&$20$&$600$\\\hline
10&  &&&$24$&$660$\\\hline
11&  &&&$0$&$500$\\\hline
12&  &&&$12$&$540$\\\hline
13&  &&&$0$&$240$\\\hline
14&  &&&$0$&$390$\\\hline
15&  &&&$0$&$120$\\\hline
16&  &&&$1$&$180$\\\hline
17&  &&&&$10$\\\hline
18&  &&&&$100$\\\hline
19&  &&&&$0$\\\hline
20&  &&&&$60$\\\hline
21 to 23&  &&&&$0$\\\hline
24&  &&&&$20$\\\hline
25 to 31&  &&&&$0$\\\hline
32&  &&&&1\\\hline\hline
\end{tabular}
\end{center}

\noindent Then $|P(2)|= 3$, $|P(3)|= 19$, $|P(4)|= 219$, $|P(5)|=4{.}231$.
\newpage

\begin{center}
\begin{tabular}{||r||r|r||r|r||r|r||r||}\hline\hline
\multicolumn{1}{||r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r||}{}\\
\multicolumn{1}{||r||}{$j$}&\multicolumn{1}{r|}{$P^{(j)}(6)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r|}{$P^{(j)}(6)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r|}{$P^{(j)}(7)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r||}{$P^{(j)}(7)$}\\\hline\hline
$1$&$0$&$22$&$4{.}800$&1&0&37&$10{.}080$    \\\hline
$2$&$0$&$23$&$720$&2&0&38&$42{.}120$        \\\hline
$3$&$0$&$24$&$3{.}600$&3&0&39&$12{.}600$         \\\hline
$4$&$0$&$25$&$600$&4&0&40&$45{.}360$           \\\hline
$5$&$0$&$26$&$1{.}680$&5&0&41&$2{.}940$          \\\hline
$6$&$0$&$27$&$360$&6&0&42&$31{.}500$           \\\hline
$7$&$720$&$28$&$1{.}530$&7&0&43&$1{.}680$        \\\hline
$8$&$1{.}800$&$29$&$0$&8&$5{.}040$&44&$23{.}940$         \\\hline
$9$&$3{.}960$&$30$&$720$&9&$ 15{.}120$&45&$4{.}200$        \\\hline
$10$&$6{.}570$&$31$&$0$&10&$ 37{.}800$&46&$5{.}040$        \\\hline
$11$&$9{.}480$&$32$&$480$&11&$73{.}080$&47&$0$        \\\hline
$12$&$11{.}520$&$33$&$12$&12&$123{.}900$&48&$15{.}120$         \\\hline
$13$&$11{.}760$&$34$&$60$&13&$183{.}960$&49&$420$           \\\hline
$14$&$12{.}960$&$35$&$0$&14&$245{.}070$&50&$4{.}620$        \\\hline
$15$&$10{.}820$&$36$&$300$&15&$288{.}120$&51&$420$       \\\hline
$16$&$12{.}240$&$37$ to $39$&$0$&16&$350{.}280$&52&$6{.}720$           \\\hline
$17$&$8{.}280$&$40$&$120$& 17&$355{.}740$&53&$0$         \\\hline
$18$&$10{.}290$&$41$ to $47$&$0$&18&$414{.}540$&54&$2{.}520$       \\\hline
$19$&$4{.}110$&$48$&$30$ &19&$381{.}360$&55&$0$            \\\hline
$20$&$7{.}080$&$49$ to $63$&$0$&20&$430{.}920$&56&$4{.}410$      \\\hline
$21$&$3{.}420$&$64$&$1$&21&$328{.}020$&57 to 59&$0$           \\\hline
&&&&22&$401{.}940$&60&$2{.}520$\\\hline
&&&&23&$290{.}710$&61 to 63&$0$\\\hline
&&&&24&$346{.}500$&64&$1{.}050$\\\hline
&&&&25&$209{.}160$&65&$14$\\\hline
&&&&26&$292{.}740$&66&$84$\\\hline
&&&&27&$150{.}360$&67&$0$\\\hline
&&&&28&$232{.}260$&68&$210$\\\hline
&&&&29&$95{.}760$&69 to 71&$0$\\\hline
&&&&30&$192{.}500$&72&$700$\\\hline
&&&&31&$67{.}200$&73 to 79&$0$\\\hline
&&&&32&$137{.}970$&80&$210$\\\hline
&&&&33&$50{.}400$&81 to 95&$0$\\\hline
&&&&34&$100{.}086$&96&$42$\\\hline
&&&&35&$20{.}622$&97 to 157&$0$\\\hline
&&&&36&$90{.}090$&128&$1$\\\hline\hline
\end{tabular}
\end{center}

\noindent $|P(6)|= 130{.}023$ and $|P(7)|= 6{.}129{.}859.$

\medskip

\noindent Ern\'e \cite{EM4} determines the numbers $P^{(j)}(n)$, $ 1\leq n\leq 6$, $1\leq j\leq 2^n$, and his tables coincide with the ones above.
To determine $|P(n)|$, $ 2\leq n\leq 9$, Ern\'e \cite{EM4} defines:
$$\tilde{P}^{(j)}(n)=\sum\limits_{r=0}^n {n \choose r}P^{(j)}(n-r)(-j)^r,\;\;1\leq j\leq 2^n,$$
and proves

\begin{equation}
\label{E1}
|P(n)|= \sum\limits_{m=1}^{n} {n \choose m} E(n,m), \;\;{\rm where} \;\; E(n,m)= \sum\limits_{j=1}^{2^{n-m}} \tilde{P}^{(j)}(n-m)\, j^m .
\end{equation}

\noindent Let $P(n,m)$,  $1\leq m\leq n$, be the number of posets with $n$ elements and $m$ minimal elements. Note that $P(n,m)={n \choose m} E(n,m),\; 1\leq m\leq n$. Ern\'e  proves that:

\begin{equation}
\label{E2}
E(n,1)=E(n,2) =|P(n-1)|, \; E(n,n)=1.
\end{equation}
From the values $P^{(j)}(7)$,  $1\leq j\leq 128,$ we obtain:

\begin{center}
\begin{tabular}{||r||r|r||r|r||r|r||r||}\hline\hline
\multicolumn{1}{||r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r|}{}&\multicolumn{1}{r||}{}&\multicolumn{1}{r||}{}\\
\multicolumn{1}{||r||}{$j$}&\multicolumn{1}{r|}{$\tilde{P}^{(j)}(7)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r|}{$\tilde{P}^{(j)}(7)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r|}{$\tilde{P}^{(j)}(7)$}&\multicolumn{1}{r||}{$j$}&\multicolumn{1}{r||}{$\tilde{P}^{(j)}(7)$}\\\hline\hline
1&-1&19&-165.270&37&10.080&55&0\\\hline
2&448&20&-56.280 &38&42.210&56&4.410\\\hline
3&-10.206&21&-174.720 &39&12.600&57 to 59&0\\\hline
4&32.256&22&-337.260 &40&11.760&60&2.520\\\hline
5&26.250&23&174.790&41&2.940&61 to 63&0\\\hline
6&90.720&24&-16.380&42&31.500&64&602\\\hline
7&-436.590&25&104.160&43&1.680&65&14\\\hline
8&-207.760&26&-13.020&44&23.940&66&84\\\hline
9&275.940&27&82.320&45&4.200&67&0\\\hline
10&123.900&28&-67.620&46&5.040&68&210\\\hline
11&613.620&29&95.760&47&0&69 to 71&0\\\hline
12&63.420&30&41.300&48&5.040&72&700\\\hline
13&-34.440&31&67.200&49&420&73 to 79&0\\\hline
14&580.230&32&51.954&50&4.620&80&210\\\hline
15&-280.980&33&47.628&51&420&81 to 95&0\\\hline
16&-196.280&34&85.806&52&6.720&96&42\\\hline
17&-568.890&35&20.622&53&0&97 to 157&0\\\hline
18&-201.600&36&14.490&54&2.520& 128&1\\\hline\hline
\end{tabular}
\end{center}

\noindent From equation (\ref{E2}) and the Ern\'e's results, $E(10,1)=E(10,2)=|P(9)|=44{.}511{.}042{.}511$, $E(10,10)=1$. From the preceding  tables and the formula Ern\'e's formula (\ref{E1}),  we obtain $E(10,m)$, $3\leq m\leq 9$.

\begin{center}
\begin{tabular}{||lr||lr||}\hline\hline
$E(10,1)=$&$44{.}511{.}042{.}511$&$E(10,2)=$&$44{.}511{.}042{.}511$\\
$E(10,3)=$&$21{.}724{.}257{.}583$&$E(10,4)=$&$6{.}110{.}970{.}115$\\
$E(10,5)=$&$1{.}004{.}241{.}331$&$E(10,6)=$&$91{.}323{.}031$\\
$E(10,7)=$&$4{.}109{.}383$&$E(10,8)=$&$77{.}635$\\
$E(10,9)=$&$511$&$E(10,10)=$&$1$\\\hline\hline
\end{tabular}
\end{center}

\noindent Then:

$$|P(10)|=\sum\limits_{j=1}^{10} {10 \choose j} E(10,j)=6{.}611{.}065{.}248{.}783$$
\newpage
\noindent Let $CP(n,m)$ ($NCP(n,m)$), $1\leq m\leq n$, be the number of connected (non-connected) posets with $n$ elements and $m$ minimal elements. S. Savini and I. Viglizzo \cite{MSV}, have obtained the following formulas:

\noindent If $n\geq 6:$\\
$CP(n,n-5)={n \choose n-5}(31^{n-5}+20\;23^{n-5}+60\;19^{n-5}+100\;17^{n-5}+$
$5\;16^{n-5}+105\; 15^{n-5}+120\;14^{n-5}+390\;13^{n-5}+ 180\;12^{n-5}$
$-120\;11^{n-5}+370\;10^{n-5}-520\; 9^{n-5}-340\;8^{n-5}-1{.}040\;7^{n-5}-750\;6^{n-5}+$
$1{.}224\;5^{n-5}+360\;4^{n-5}-90\; 3^{n-5}-80\;2^{n-5}+5).$\\[2mm]
If $n\geq 5:$\\
$CP(n,n-4)={n \choose n-4}(15^{n-4}+12\; 11^{n-4}+24\;9^{n-4}+16\;8^{n-4}+20\;7^{n-4}+$
$27\;6^{n-4}-108\;5^{n-4}-42\;4^{n-4}+30\;3^{n-4}+24\;2^{n-4}-4).$\\[2mm]
$NCP(n,n-4)={n\choose{n-4}} (16^{n-4}-15^{n-4}+12\;12^{n-4}-12\;11^{n-4}+24\;10^{n-4}-$
$4\;9^{n-4}+34\;7^{n-4}-135\;6^{n-4}+12\;5^{n-4}+42\;4^{n-4}+78\;3^{n-4}-56\;2^{n-4}+5).$\\[2mm]
If $n \geq 4:$\\
$CP(n,n-3)={n \choose n-3}\left( 7^{n-3}+6\; 5^{n-3}+ 3\; 4^{n-3}- 7\;3^{n-3}-6\;2^{n-3}+3\right).$\\[2mm]
$NCP(n,n-3)= {n\choose{n-3}}(8^{n-3}-7^{n-3}+6\;6^{n-3}-9\;4^{n-3}-11\;3^{n-3}+18\;2^{n-3}-4).$\\[2mm]
If $n\geq 3:$\\
$CP(n,n-2)={n \choose n-2}\left(3^{n-2}+ 2^{n-2}-2\right).$\\[2mm]
$NCP(n,n-2) ={n \choose n-2}\left(4^{n-2}+ 3^{n-2} -5 \;2^{n-2} +3\right).$\\[2mm]
It is easy to see that, if $n\geq 2$ then $CP(n,n-1)=n$ and $NCP(n,n-1)=n(2^{n-1}-2)$.

\medskip

\noindent From the   preceding formulas, $P(n,1)= |P(n-1)|,\; P(n,2)= {n \choose 2}|P(n-1)|,\; P(n,n)=1$ and
\begin{center}
\begin{tabular}{lr}\\
${8 \choose 7}\;CP(7,2)\;CP(1,1)=$&$19{.}862{.}808$\\[2mm]
${8 \choose 6}\;CP(6,2)\;CP(2,1)=$&$3{.}013{.}080$\\[2mm]
${8 \choose 5}\;CP(5,2)\;CP(3,1)=$&$821{.}520$\\[2mm]
${8 \choose 5}\;CP(5,1)\;CP(3,2)=$&$183{.}960$\\[2mm]
${8 \choose 4}\;CP(4,2)\;CP(4,1)=$&$351{.}120$\\[2mm]
${8 \choose 6}\;CP(6,1)\;{2 \choose 1}\;PC(1,1)\;CP(1,1)/2!=$&$710{.}808$\\[2mm]
${8 \choose 5}\;CP(5,1)\;{3 \choose 2}\;PC(2,1)\;CP(1,1)=$&$367{.}920$\\[2mm]
${8 \choose 4}\;CP(4,1)\;{4 \choose 3}\;PC(3,1)\;CP(1,1)=$&$191{.}520$\\[2mm]
${8 \choose 4}\;CP(4,1)\;{4 \choose 2}\;PC(2,1)\;CP(2,1)/2!=$&$63{.}840$\\[2mm]
${8 \choose 3}\;CP(3,1)\;{5 \choose 3}\;CP(3,1)\;CP(2,1)/2!=$&$45{.}360$\\\hline
$NCP(8,3)=$ & $25{.}611{.}936$
\end{tabular}
\end{center}

\noindent we can determine $|P(n)|,\; 2\leq n\leq 8,$ without the aid of any computer program.\\[2mm]
We have obtained the following results about $P(n)$, \cite{MSV}:

 \begin{itemize}
\item  We have determined the numbers  $CP^{(j)}(n)$ ($NCP^{(j)}(n)$)  of conected (non-conected) posets on $n$ elements and $j$ antichains for $1\leq n\leq 7$ and $1\leq j\leq 2^n$, which can be seen in  the Hasse diagrams indicated above.
    \item We proved that, if $n\geq 5$, $P^{(2^{n-1})}(n)=NCP^{(2^{n-1})}(n)$, and if $n \ge 6$:

\begin{itemize}

\item If   $j\ge 2^{n-1}+2$ then $CP^{(j)}(n)=0$,
\item  $P^{(7\, 2^{n-4})}(n)=NCP^{(7\, 2^{n-4})}(n)$,
\item   $P^{(15\, 2^{n-5})}(n)=NCP^{(15\, 2^{n-5})}(n)$,
\item $P^{(2^{n-1}+1)}(n)=CP^{(2^{n-1}+1)}(n)$,
\item  $NCP^{(2^{n-1}+2)}(n)= 2(n-1)n$ and $CP^{(2^{n-1}+2)}(n)=0,$
\item  $CP^{(7\;2^{n-4})}(n)=CP^{(15\;2^{n-5})}(n)=CP^{(2^{n-1})}(n)=NCP^{(2^{n-1}+1)}(n)=0.$
\end{itemize}

\item  We also obtained the following formula to determine the number of non-connected posets with $n$ elements and $2$ minimal elements, when $n\geq 3$.

\begin{equation}
\label{E91}
|PNC(n,2)|=\cases{{\rm If}\;\; n  \;\; {\rm is \;\;even,}\cr
\cr
\displaystyle{\sum\limits_{k=1}^{\frac{n}{2}-1} {n \choose k} |PC(k,1)|.|PC(n-k,1)|}+\displaystyle{{n \choose \frac{n}{2}} \frac{|PC(\frac{n}{2},1)|^2}{2}},\cr
\cr
{\rm if}\;\; n  \;\; {\rm is \;\;odd,}\cr
\cr
\displaystyle{\sum\limits_{k=1}^{\frac{n-1}{2}} {n \choose k} |PC(k,1)|.|PC(n-k,1)|.}}
\end{equation}
\end{itemize}

\newpage

redpajama_set_name: RedPajamaArXiv