Well yeah, but it includes mirrors and useless changes.
4 options per joint
20 joints
4^20 = 1,099,511,627,776 configurations per frame
you have that many options 500 times so
1,099,511,627,776 * 500 = 549,755,813,888,000
aka a lot
The vast majority of those outcomes are total garbage though, akin to having millions of spastic seizures all over your keyboard, and an unholy assload of them are also extremely similar. Thing is, however, even if 99.999% of them are useless outcomes, that still leaves us with 5.5 billion viable replays.
also thanks guys c: