Party Size, Monster Level

Out of curiosity, does anyone know the formula that is used to calculate monster level with different party sizes? I've done a lot of Googling but I just can't find anything that talks about something other than experience share in parties.|||The monster level doesn't change, but monsters have 50% more life and provide 50% more XP per player beyond the first. Their attacks get a 1/16 bonus per additional player as well.|||Prob a noob question but is there any way to simulate more players on the ladder (similar to the /player 8 command?)|||Alas there is not. On battle.net, you physically need more players in the game.