#include <cstdio>
#include <iostream>

using namespace std;

int arr[105][105];
int n;
int x, y, k;                    //k为元素的值


int main()
{
    while(scanf("%d", &n) && n)
    {
        k = 1;        //为下次作准备
        x = 1;
        y = 0;
        while(k <= n)    //k最多不超过n的大小
        {
            while(y < n && !arr[x][y+1])    arr[x][++y] = k;
            while(x < n && !arr[x+1][y])    arr[++x][y] = k;
            while(y > 1 && !arr[x][y-1])    arr[x][--y] = k;
            while(x > 1 && !arr[x-1][y])    arr[--x][y] = k;
            k++;
        }
        for(int i = 1; i <= n; ++i)
        {
            for(int j = 1; j <= n; ++j)
            {
                printf("%d ", arr[i][j]);
                arr[i][j] = 0;              //为下次做准备
            }
            cout<<endl;
        }
        cout<<endl;
    }
    return 0;
}