David Albert Torpey added the comment:
Mr. Dickinson thank you for doing this. I do not know how to help with
a patch. If it helps, here is the code I use in python:
def factorial(n, _known=[1]):
assert isinstance(n, int), "Need an integer. This isn't a gamma"
assert n >= 0, "Sorry, can't factorilize a negative"
assert n < 1000, "No way! That's too large"
try:
return _known[n]
except IndexError:
pass
for i in range(len(_known), n+1):
_known.append(_known[-1] * i)
return _known[n]
When the assertions are turned-off, this runs pretty fast.
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