def main():
    N = int(input())
    As = [[0]*N for _ in range(N)] 
    y, x = 0, 0
    t = 1
    down = True
    pivot_frag = True
    right_down = False
    while True:
        As[y][x] = t
        t += 1
        if (y, x) == (N - 1, N - 1):
            break
        elif y == x:
            if pivot_frag:
                y += 1
                pivot_frag = False
                right_down = True
            else:
                y += 1
                x += 1
                pivot_frag = True
                down = True

        elif y == (N - 1) and x % 2 == 0:
            y, x = x, y
            down = False
            left_up = False

        elif down:
            if right_down:
                y += 1
                x += 1
                right_down = False
            else:
                x -= 1
                right_down = True
        else:
            if left_up:
                y -= 1
                x -= 1
                left_up = False
            else:
                y += 1
                left_up = True
        
    for i in range(N):
        print(*As[i])
    print()

if __name__ == "__main__":
    main()