def triangle(n): l, index = [1], 0 while index < n: print(l) l = [1] + [l[i] + l[i + 1] for i in range(len(l) - 1)] + [1] index+=1

triangle(10) [1] [1, 1] [1, 2, 1] [1, 3, 3, 1] [1, 4, 6, 4, 1] [1, 5, 10, 10, 5, 1] [1, 6, 15, 20, 15, 6, 1] [1, 7, 21, 35, 35, 21, 7, 1] [1, 8, 28, 56, 70, 56, 28, 8, 1] [1, 9, 36, 84, 126, 126, 84, 36, 9, 1]