i'm not sure if i'm completely right on this or at all.. well better than no working i guess.. :p
(2! x 4! x 5!) + (2! x 5! x 5!) + (2! x 6! x 5!)
=207360
1st bracket is if 2 is between, 2nd bracket if 1 inbetween, 3rd if none are between
bleh? sounds kinda like what archman was...