杨辉三角_python3

l = [[0]*i for i in range(1, 31)]
for i in range(30):
    for j in range(i+1):
        if j == 0 or i == j:
            l[i][j] = 1
        else:
            l[i][j] = l[i-1][j-1] + l[i-1][j]

n = int(input())
for i in range(n):
    for j in range(i+1):
        print('{:>5d}'.format(l[i][j]), end='')
    print()