1. The second number in the $n$-th row of the number array shown in Figure 3

将上面的文本翻译成英文，请保留源文本的换行和格式，直接输出翻译结果。
$$
\text { II. 1. } n^{2}-2 n+3
$$

The first number in the $n$-th row is
$$
\begin{array}{l}
3+3+5+7+\cdots+(2 n-3) \\
=2+(1+3+5+7+\cdots+2 n-3) \\
=2+\frac{(1+2 n-3)(n-1)}{2}=n^{2}-2 n+3 .
\end{array}
$$