import sys
input = sys.stdin.readline

N=int(input())
    
ANS=[[-1]*N for i in range(N)]

x=0
y=0
c=1

for i in range(N*N):
    ANS[x][y]=c
    c+=1

    if x==y and x!=0:
        if x%2==1:
            x+=1
            y+=1
        else:
            x-=1
        continue

    if ANS[y][x]==-1:
        x,y=y,x
        continue

    if x==0:
        y+=1
        continue
        
    MAX=max(x,y)

    if MAX%2==0:
        if x==MAX:
            y-=1
        else:
            x-=1
    else:
        if x==MAX:
            y+=1
        else:
            x+=1

for ans in ANS:
    print(*ans)