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Factorial (!)Binomial

Factorial2

FilledSmallSquaren!! gives the double factorial of n.

FilledSmallSquare Mathematical function (see Section A.3.10).

FilledSmallSquare.

FilledSmallSquare is a product of even numbers for even, and odd numbers for odd.

FilledSmallSquare See The Mathematica Book: Section 3.2.5.

FilledSmallSquare See also: Gamma.

Further Examples

Factorial (!)Binomial