Subfactorial

Available

Returns the subfactorial (number of derangements).

Forms

Subfactorial[n]

Verified examplesSubfactorial[0] → 1

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Topics

Combinatorial Functions - General
Gamma Functions And Related Functions - Integer-Oriented Functions
New In60 Alphabetical Listing - S
New In60 Number Theory And Integer Functions - New Combinatorial & Recurrence Functions

Related

Factorial Gamma AlternatingFactorial Permutations BellB Binomial CatalanNumber Factorial2 FactorialPower Hyperfactorial BellY Beta

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