n = int(input())
a = [[0] * (n+1) for _ in range(n+1)]  # 创建n+1大小的二维数组，保持1-based索引
h, k, l, b, hy = n-1, 1, 1, 2, 0

for i in range(n):
    h = n - hy
    l = 1
    while l != b:
        a[h][l] = k
        k += 1
        l += 1
    l -= 1
    while h != n:
        h += 1
        a[h][l] = k
        k += 1
    b += 1
    hy += 1

for i in range(1, n+1):
    for j in range(1, n+1):
        print(f"{a[i][j]:4d}", end="")
    print()