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, $3!!!$?
I have tried: http://www.wolframalpha.com/input/?i=(((3!)!)!)