spiral

#include <iostream>
#include <fstream>
#include <cmath>
#include <math.h>


using namespace std;

int n;

int main(int argc, const char * argv[]) {

    cin >> n;
    int y = 1;
    int k = 17;
    int c = n - 1;
    int m = n * 3 - 2;
    for (int i = 1 ; i <= n - 1 ; i++ ){
        for(int j = y ; j <= y + c  ; j++ ){
            cout << j << " ";
        }
        cout << endl ;
   		y = y + c;
   		c = c - 1;
    }
}