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Krishna Vedala 2020-06-25 09:59:36 -04:00
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/**
* @file
* @brief Compute double factorial: \f$n!!\f$
* @brief Compute [double
* factorial](https://en.wikipedia.org/wiki/Double_factorial): \f$n!!\f$
*
* Double factorial of a non-negative integer n, is defined as the product of
* Double factorial of a non-negative integer `n`, is defined as the product of
* all the integers from 1 to n that have the same parity (odd or even) as n.
* <br/>It is also called as semifactorial of a number and is denoted by
* \f$n!!\f$