Let $n$ be a natural number. Find the least natural number $k$ for which there exist $k$ sequences of $0$ and $1$ of length $2n+2$ with the following property: any sequence of $0$ and $1$ of length $2n+2$ coincides with some of these $k$ sequences in at least $n+2$ positions.
1. **Understanding the Problem:**
   We need to find the smallest number \( k \) such that there exist \( k \) sequences of length \( 2n+2 \) where any sequence of length \( 2n+2 \) coincides with at least one of these \( k \) sequences in at least \( n+2 \) positions.

2. **Case Analysis for \( k = 4 \):**
   Consider the following four sequences:
   \[
   \begin{aligned}
   &S_1 = \underbrace{00\ldots 00}_{2n+2}, \\
   &S_2 = \underbrace{11\ldots 11}_{2n+2}, \\
   &S_3 = \underbrace{00\ldots 0}_{2n+1}1, \\
   &S_4 = \underbrace{11\ldots 1}_{2n+1}0.
   \end{aligned}
   \]
   We need to show that any sequence \( S \) of length \( 2n+2 \) will coincide with at least one of these sequences in at least \( n+2 \) positions.

3. **Verification for \( k = 4 \):**
   - Consider any sequence \( S \) of length \( 2n+2 \).
   - If \( S \) is all zeros or all ones, it will coincide with \( S_1 \) or \( S_2 \) in all \( 2n+2 \) positions.
   - If \( S \) has a mix of zeros and ones, it will coincide with \( S_3 \) or \( S_4 \) in at least \( n+2 \) positions because the sequences \( S_3 \) and \( S_4 \) are designed to cover the cases where the last bit differs.

4. **Case Analysis for \( k = 3 \):**
   Assume we have only three sequences. Without loss of generality, let these sequences be:
   \[
   \begin{aligned}
   &T_1 = \underbrace{0\ldots 0}_{d}\underbrace{0\ldots 0}_{x}\underbrace{0\ldots 0}_{y}\underbrace{0\ldots 0}_{z}, \\
   &T_2 = \underbrace{0\ldots 0}_{d}\underbrace{0\ldots 0}_{x}\underbrace{1\ldots 1}_{y}\underbrace{1\ldots 1}_{z}, \\
   &T_3 = \underbrace{0\ldots 0}_{d}\underbrace{1\ldots 1}_{x}\underbrace{0\ldots 0}_{y}\underbrace{1\ldots 1}_{z},
   \end{aligned}
   \]
   where \( d + x + y + z = 2n+2 \).

5. **Constructing a Counterexample:**
   - If \( x, y, z \) are all even, consider the sequence:
     \[
     S = \underbrace{1\ldots 1}_{d}\underbrace{0\ldots 0}_{x/2}\underbrace{1\ldots 1}_{x/2}\underbrace{0\ldots 0}_{y/2}\underbrace{1\ldots 1}_{y/2}\underbrace{0\ldots 0}_{z/2}\underbrace{1\ldots 1}_{z/2}.
     \]
   - If only one of \( x, y, z \) is even, say \( x \), consider the sequence:
     \[
     S = \underbrace{1\ldots 1}_{d}\underbrace{0\ldots 0}_{x/2}\underbrace{1\ldots 1}_{x/2}\underbrace{0\ldots 0}_{(y-1)/2}\underbrace{1\ldots 1}_{(y+1)/2}\underbrace{0\ldots 0}_{(z+1)/2}\underbrace{1\ldots 1}_{(z-1)/2}.
     \]
   - In both cases, the sequence \( S \) will coincide with any of the chosen three sequences in at most \( n \) positions, which is less than \( n+2 \).

6. **Conclusion:**
   Since \( k = 3 \) sequences are not sufficient to ensure the required coincidence in at least \( n+2 \) positions, we conclude that the least number \( k \) must be \( 4 \).

The final answer is \( \boxed{ k = 4 } \).