C :

#include<stdio.h>
int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
	int a,b,c,d,n,sum=1;
	int yi[101][101];
	scanf("%d",&n);
	for(a=0;a<=(n-1)/2;a++)
	{
		for(b=a;b<=n-a-1;b++)
			yi[b][n-a-1]=sum++;
		for(b=n-2-a;b>=a;b--)
			yi[n-a-1][b]=sum++;
		for(b=n-a-2;b>=a;b--)
			yi[b][a]=sum++;
		for(b=a+1;b<n-a-1;b++)
			yi[a][b]=sum++;
	}
	for(c=0;c<n;c++)
	{
		for(d=0;d<n;d++)
			printf("%d ",yi[c][d]);
		printf("\n");
	}
}