StevenXClontz’s Twitter Archive—№ 3,858

…in reply to @siwelwerd
@siwelwerd @matthematician Wait is this (0!)! or that weird parity psuedo-factorial n!!=Π{m:0<m≤n,m%2=n%2}?
On twitter.com 2020 Mar 30 Mood -2 🙁