$ perl -w permute_n.pl 18 0 2 4 -5 -3 -1
0: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18
2: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,17,16,18
4: 1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,18,16,17
6402373705727995: 18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,1,3,2
6402373705727997: 18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,2,3,1
6402373705727999: 18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,3,2,1