#include <iostream> using namespace std; int main() { int n; while (cin >> n) { for (int i = 1; i <= 2 * n - 1; i++) { int k = 0; if (i > n) k = 2*n - i; else k = i; int num = 1; for (int j = 1; j < n + k; j++) { if (j <= n - k) cout << " "; else if (j < n) cout << num++; else cout << num--; } cout << endl; } } return 0; }