In the $n \times n$ table in every cell there is one child. Every child looks in neigbour cell. So every child sees ear or back of the head of neighbour.  What is minimal number children, that see  ear ?
1. **Graph Construction**:
   - Associate each child with a node in a graph, positioned at the center of the square they occupy.
   - Construct a directed edge from each node to the node of the child they are facing.
   - Each node has an outdegree of one, and every edge has a unique direction.

2. **Definition of a Corner**:
   - Define a "corner" of the graph as a node where the associated edges form a $90^{\circ}$ angle.
   - For each corner, there is at least one child facing another child such that the child sees the ear of the neighbor.

3. **Counting Corners**:
   - We need to show that there are at least $n+2$ corners in the graph.
   - Any digraph where each vertex has an outdegree of at least one must contain a cycle.
   - Since every edge is parallel to the edges of the original square and no vertex directs to itself, there must be at least two columns and at least two rows containing at least two corners.

4. **Row and Column Analysis**:
   - Suppose a row has no corners. This implies no edge is contained within that row.
   - Consequently, every column must contain some corner.
   - Therefore, there must be at least $n+2$ corners in the graph.

5. **Construction Example**:
   - Consider the children standing on the $n^2$ lattice points of $S = \{0,1,\dots,n\} \times \{0,1,\dots,n-1\}$.
   - Let the child at $(x,y) \in S$ face:
     \[
     \begin{cases}
     \text{South} & \text{if } x > 0 \text{ and } y > 0 \\
     \text{West} & \text{if } x > 0 \text{ and } y = 0 \\
     \text{North} & \text{if } x = 0 \text{ and } y \in \{0,1,\dots,n-2\} \\
     \text{East} & \text{if } (x,y) = (0,n-1)
     \end{cases}
     \]
   - This construction ensures that the minimal number of children seeing the ear of a neighbor is achieved.

6. **Conclusion**:
   - The minimal number of children that see the ear of a neighbor is $n+2$.

The final answer is $\boxed{n+2}$