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bthiessen's scripts tagged enumerative combinatorics
- bthiessen/factorial2
written by
bthiessen
Double Factorial: Factorial function which only considers integers in the sequence of same parity (6!! = 6 x 4 x 2)
- bthiessen/subfactorial
written by
Subfactorial: (derangement) permutation of the elements of a set, such that no element appears in its original position