Hello. I wonder why
gamma(n).evalf(subs={n:i}) works only when i>2
>>> gamma(n).evalf(subs={n:3})
2.00000000000000
>>> gamma(n).evalf(subs={n:2})
gamma(n)
>>> gamma(n).evalf(subs={n:1})
gamma(n)
>>> gamma(n).evalf(subs={n:4})
6.00000000000000
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