[@Letter Bee][@OneStoryToMany] Vault 43 is actually a canon Vault that appeared in [url=http://imgur.com/gallery/7lIvV]a webcomic published by Bethesda and drawn by the guys from Penny Arcade.[/url]

It's a vault that housed 20 men, 10 women and a panther.

But this is an Alternate Timeline from the canon Fallout universe, so different vault numbers are fine.