Permutation list from cycle notation or a permutation list
PermutationList[perm]
PermutationList[perm, len]
PermutationList[Cycles[{{3, 2}, {1, 6, 7}}]]
→ {6, 3, 2, 4, 5, 7, 1}PermutationList[Cycles[{{3, 2}, {1, 6, 7}}], 9]
→ {6, 3, 2, 4, 5, 7, 1, 8, 9}PermutationList[Cycles[{}]]
→ {}