How many aliens per crash site?

[7Saturn]

I wonder, how many aliens are usually deployed at a mission. I thought, at some point, I saw a list or aliens per UFO sorted by game difficulty, somewhere. I just had a look in the Ufopaedia, but without success. Is there some comprehensive list about that topic, somewhere?

[Meridian]

Ufopedia lists it too, per ufo type.

Look into the alien deployment section.
For example for medium scout: https://www.ufopaedia.org/index.php/Medium_Scout#Alien_Deployment

[7Saturn]

I knew, I had seen it somewhere. Thanks.