模拟考试——输出杨辉三角

n=eval(input())
m=[[1]]
for k in range(0,n-1):
    m.append([1,1])
if n>=3:
    for i in range (2,n):
        for j in range (1,n-1):
            c=m[i-1][j-1]+m[i-1][j]
            m[i].insert(j,c)
print(m)