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Documentation / Mathematica / Built-in Functions / Mathematical Functions / Factorial Related /

Factorial2

FilledSmallSquare n!! 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 Section 3.2.5.

FilledSmallSquare See also: Gamma.

FilledSmallSquare New in Version 1.

Further Examples