#include <bits/stdc++.h>
using namespace std;
int main() {
  int n;
  cin >> n;
  int odd = 1, even = 2;
  for (int i = 1; i <= n; i++) {
    if (i == (n / 2) + 1) {
      for (int j = 1; j <= n; j++) {
        cout << odd << " ";
        odd += 2;
      }
      cout << endl;
    } else if (i < (n / 2) + 1) {
      for (int j = 1; j <= n; j++) {
        if (j > (n - (i * 2 - 1)) / 2 && j <= (n - ((n - (i * 2 - 1)) / 2))) {
          cout << odd << " ";
          odd += 2;
        } else {
          cout << even << " ";
          even += 2;
        }
      }
      cout << endl;
    } else {
      int ii = ((n / 2) + 1) - (i - ((n / 2) + 1));
      for (int j = 1; j <= n; j++) {
        if (j > (n - (ii * 2 - 1)) / 2 && j <= (n - ((n - (ii * 2 - 1)) / 2))) {
          cout << odd << " ";
          odd += 2;
        } else {
          cout << even << " ";
          even += 2;
        }
      }
      cout << endl;
    }
  }
}
