#include <stdio.h>
#include <stdlib.h>

void recursive(int, int);

int a[31][31];
int count;

int main(void) {
  int n, i, j;
  
  scanf("%d", &n);
  count = 1;
  recursive(n, 0);
  
  for (j = 0; j < n; j++) {
    for (i = 0; i < n; i++) {
      printf("%03d ", a[i][j]);
    }
    printf("\n");
  }
  
  return EXIT_SUCCESS;
}

void recursive(int n, int layer) {
  int i, j;
  
  if (n <= 0)
    return;

  for (i = 0; i < n; i++)
    a[i + layer][layer] = count++;
  for (j = 1; j < n; j++)
    a[n - 1 + layer][j + layer] = count++;
  for (i = n - 2; i >= 0; i--)
    a[i + layer][n - 1 + layer] = count++;
  for (j = n - 2; j > 0; j--)
    a[layer][j + layer] = count++;
  
  recursive(n - 2, layer + 1);
}