1495 : 대각선 지그재그

n = int(input())

arr = [[0 for i in range(n+1)] for j in range(n+1)]

y=x=0
num=1

for i in range(1,n+1):
    for j in range(i):
        arr[y][x]=num
        num+=1
        if i % 2 == 1 : 
            y+=1;x-=1
        else :
            y-=1;x+=1
    if i % 2 == 1 : x+=1
    else : y+=1
if i%2==0 :
    y+=1;x-=1
else:
    y-=1;x+=1

for i in range(n-1,0,-1):
    for j in range(i):
        arr[y][x]=num
        num+=1
        if i % 2 == 1 : 
            y+=1;x-=1
        else :
            y-=1;x+=1
    if i % 2 == 1 : y-=1;x+=2
    else : y+=2;x-=1



for i in range(n):
    for j in range(n):
        print(arr[i][j],end=' ')
    print()