4 = Sub-factorial (DERANGEMENT) I Learn Left-factorial or Sub-factorial - YouTube
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.
Mathematical Meanderings: Subfactorials, Semifactorials and Others
1. Recall that ni (called subfactorial) is the number | Chegg.com
Pat'sBlog: The Subfactorial and Some Historical Notes
subfactorials
Subfactorial Formula | Left Factorial | Factorial - YouTube
Learn How to Solve SubFactorials (Left Factorials) | Quick & Simple Explanation - YouTube
Subfactorial - Statistics How To
The CAT: Factorial basic concepts
PERMUTATION CALCULATOR DERANGEMENT CALCULATOR
Subfactorial - Statistics How To
Formula for the number of derangement of a derangement? - Quora
Art of Problem Solving
javascript - Why is my subfactorial function off by one? - Stack Overflow
code golf - Deranged !Combinatorics: Compute the Subfactorial - Code Golf Stack Exchange
Subfactorials — Another twist on Factorials | by Jaken Herman | Medium
Derangement - Wikipedia
Stats Calculator Free for Android - Download | Bazaar
Factorial | Math Wiki | Fandom
Subfactorial -- from Wolfram MathWorld
Extra-math - 🔸️Primorial & Alternating Factorial | Facebook
Subfactorial / X
