Yes but you are looking 60 snakes breeding in pairs. 1 snake breeds to 60 snakes = 60. You have 60 different snakes breeding to 60 snakes = 60 x 60. Not only that but for every iteration you have to remove one for the set that was previously done in the last iteration. It has to be different than number combinations. I think it's a little different than a 2 digit number combination which results in many many many possibilities. Now if you start looking at combo morphs with up to 60 combos bred to 60 combos then your numbers could get way up there.