@Christopher2222 

I apologise, I thought that "Branch" meant something else.

I am new to the site.

I could have phrased it easier. We have a group action of the symmetric group of 256 things on the numbers {1,2,3,...,256}.

The permutation (1,2,3) say, sends 1 to 2, 2 to 3 and 3 to 1.

I would like to know firstly how to define a permutation and then how I can get maple to tell me the outcome of the permutation on each of the numbers 1,2,3.

e.g. if perm represents this permutation then I want something like:

perm(1) = 2

perm(2) = 3

perm(3) = 1