Python implementation of the Ackermann function

Ackermann.py

def Ackermann(x, y):
    answer = 0

    if x == 0:
        answer = y + 1
    elif y == 0:
        answer = Ackermann(x - 1, 1)
    else:
        answer = Ackermann(x - 1, Ackermann(x, y - 1))
    
    return answer


for x in range(0, 6):
    for y in range(0, 6):
        print(Ackermann(x, y))