How to find multifactorials $ n\underbrace{!!\ldots !}_m$ in Wolframalpha?

Asked Jan 10 '18 at 05:39

Active Jan 10 '18 at 05:45

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I heed to compute $ n\underbrace{!!\ldots !}_m$.

The formula is $ n\underbrace{!!\ldots !}_m = \prod_{i=1}^{k}(mi-r)$, $n=3m-r$, $k \in Z$, $r \in \{0,1,\ldots, m-1\}$.

Question. Is it exist a short formula in Wolframalpha to find, for example, $3!!!$?

edited Jan 10 '18 at 05:45

ℋolo

asked Jan 10 '18 at 05:39

Nick

I don't understand what you are searching for, are you searching for the algorithm Wolframalpha uses? – ℋolo Jan 10 '18 at 05:46
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try to use this – Masacroso Jan 10 '18 at 05:46
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It appears that Wolfram only explicitly allows for double factorials, which can be used with factorial2[x] or double factorial x. – Tyberius Jan 10 '18 at 05:50

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