4.9.3 Combinatorial functions

cl_I factorial (uintL n)

n must be a small integer >= 0. This function returns the factorial n! = 1*2*…*n.

cl_I doublefactorial (uintL n)

n must be a small integer >= 0. This function returns the doublefactorial n!! = 1*3*…*n or n!! = 2*4*…*n, respectively.

cl_I binomial (uintL n, uintL k)

n and k must be small integers >= 0. This function returns the binomial coefficient for 0 <= k <= n, 0 else.

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