C++ :

#include<iostream> 
#include<stdio.h>
#include<string.h>
const int N = 100;
int a[N][N];

using namespace std;
int main()
{
	//freopen("2.in","r",stdin);
	//freopen("2.out","w",stdout);
	int T;
	cin>>T; 
	while(T--)
	{
		int n;
		cin>>n;
		memset(a,0,sizeof(a));
		int x=0,y=n-1;
		int t=a[x][y]=1;
		while(t<n*n)
		{
			
		
			while(y-1>=0&&!a[x][y-1]) a[x][--y]=++t;
			while(x-1>=0&&!a[x-1][y]) a[--x][y]=++t;
			while(y+1<n&&!a[x][y+1]) a[x][++y]=++t;
			while(x+1<n&&!a[x+1][y]) a[++x][y]=++t;	
		}
		for(x=0;x<n;x++)
			for(y=0;y<n;y++) 
				printf("%d%s",a[x][y],y!=n-1?" ":"\n");
		puts("");
	}
	return 0;
}