Factorial2

Available

Returns the double factorial.

Forms

n !!

Verified examplesFactorial2[0] → 1

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Topics

Combinatorial Functions - General
Gamma Functions And Related Functions - Integer-Oriented Functions
Recurrence And Sum Functions - General

Related

Factorial Gamma Pochhammer Binomial FactorialPower BellB CatalanNumber Hyperfactorial PolyGamma StirlingS1 StirlingS2 Subfactorial

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