Ошибка RecursionError: maximum recursion depth exceeded in comparison

from functools import lru_cache
@lru_cache
def F(n):
    if n == 1:
        return 1
    if n > 1:
        return F(n-1) + 10 * G(n-1) + 15 * n
@lru_cache    
def G(n):
    if n == 1:
        return 1
    if n > 1:
        return F(n-1) - 2 * G(n-1)
print(G(675))

Traceback (most recent call last):
  File "<string>", line 14, in <module>
File "<string>", line 13, in G
  File "<string>", line 7, in F
  File "<string>", line 7, in F
  File "<string>", line 7, in F
  [Previous line repeated 495 more times]
  File "<string>", line 4, in F
RecursionError: maximum recursion depth exceeded in comparison
> 

если убрать @lru_cache ошибку вроде не выдает, но слишком долго работает (работает вообще?)