def calnum(num):
  if num != 1:
    # 递归调用自身函数
    csum = num * calnum(num - 1)
  else:
    # 设置递归出口
    csum = 1

  return csum

ret = calnum(5)
print(ret)

import sys
# 设置允许的调用次数为2000
sys.setrecursionlimit(2000)

            0
          0  1  1
        0  1  1  2  3
      0  1  1  2  3  5  8
    0  1  1  2  3  5  8 13 21
  0  1  1  2  3  5  8 13 21 34 55

def fei(i,j): #i为行数，j为列数
  if i == 1 or j ==1:
    return 0
  elif j == 2 :
    return 1
  else:
    return fei(i,j-1) + fei(i,j-2)
 
for i in range(1,7):
  print()
  for k in range(1,7-i): #控制空格数
    print(" ",end="")
  for j in range(1,(2*i)): 
    print(fei(i,j),"",end="")