Formula for the number of derangement of a derangement? - Quora
subfactorials
Derangements - Subfactorial Calculator - YouTube
Derangement - Wikipedia
Subfactorial -- from Wolfram MathWorld
Solved . Recall that ni (called subfactorial) is the number | Chegg.com
Factorial | Math Wiki | Fandom
Mathematical Meanderings: Subfactorials, Semifactorials and Others
Subfactorial Formula | Left Factorial | Factorial - YouTube
Subfactorial - Statistics How To
subfactorial & derangement, an explicit approach - YouTube
Pat'sBlog: The Subfactorial and Some Historical Notes
Art of Problem Solving
Maths Ed X પર: "The 265th, or subfactorial 6-th (!6-th) day of the year. There are 265 derangements of 6 objects: 265 ways 6 objects can be arranged so no object is
javascript - Why is my subfactorial function off by one? - Stack Overflow
The CAT: Factorial basic concepts
Stats Calculator Free for Android - Download | Bazaar
4 = Sub-factorial (DERANGEMENT) I Learn Left-factorial or Sub-factorial - YouTube
Subfactorial / X
Subfactorial -- from Wolfram MathWorld
Factorial Calculator – Apps no Google Play
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.
Learn How to Solve SubFactorials (Left Factorials) | Quick & Simple Explanation - YouTube
Subfactorial -- from Wolfram MathWorld
