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Derangements - Subfactorials
Calculates the number of derangements/subfactorial !n.

Factorials
Calculates the following factorial items:
* A factorial of one number such as n!
* A factorial of a numerator divided by a factorial of a denominator such as n!m!/a!b!
* Double Factorials such as n!!
* Stirlings Approximation for n!

Multifactorials
Calculates the multifactorial n!(m)