Expand a function into a factorial series
Compute the inverse factorial of a strictly positive integer by solving the gamma function for a specific value
Evaluate the multifactorial function
Fast factorial modulo a given number
Evaluate the Kurepa function
Compute an approximation to a factorial with Stirling's formula
Give the totals of the entries on the rising diagonals of a square matrix
Compute the Liouville number or its generalization
Create the Lehmer code corresponding to a given permutation
Evaluate the Hadamard gamma function
Give all the ways the numbers 1, 2, …, n can be scrambled completely
Evaluate the triple gamma function
Test whether a permutation is a derangement
Count the number of ways to partition a set where the order of the subsets matters
Compute the Schett polynomial