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4 = Sub-factorial (DERANGEMENT) I Learn Left-factorial or Sub-factorial - YouTube
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Subfactorial -- from Wolfram MathWorld
Subfactorial Formula | Left Factorial | Factorial - YouTube
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Subfactorial -- from Wolfram MathWorld
Mathematical Meanderings: Subfactorials, Semifactorials and Others
Pat'sBlog: The Subfactorial and Some Historical Notes
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subfactorial & derangement, an explicit approach - YouTube
Subfactorial -- from Wolfram MathWorld
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Factorial Calculator – Apps no Google Play
subfactorials
Solved . Recall that ni (called subfactorial) is the number | Chegg.com
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soft question - Does double subfactorial exist? - Mathematics Stack Exchange
dℝ∅ℕ∋ on X: "@fermatslibrary The nth subfactorial is the number of permutations of n objects in which no object appears in its natural place. Long story short: it's alternating series of permutations.
javascript - Why is my subfactorial function off by one? - Stack Overflow
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