#include<stdio.h> int main() {int n,i,j,k,a[20][20]; scanf("%d",&n); for(i=0;i<n;i++) {for(j=0;j<n;j++) {k=i+1<n-i?i+1:n-i; k=k<j+1?k:j+1; k=k<n-j?k:n-j; a[i][j]=k; printf("%3d",a[i][j]); } printf("\n"); } return 0; }