0 : {}
 1 : {1,12,121,123}
 2 : {2,21,23,212,2123}
 3 : {3,32,321,3212,32123}
 4 : {13,132,1321}
 5 : {213,2132,21321}
 6 : {232,2321,23212}
 7 : {1212,12123,121232,1212321,12123212}
 8 : {1213,12132,121321}
 9 : {1232,12321,123212}
10 : {13212,132123,1213212,1232123,12132123}
11 : {21232,212321,2123212}
12 : {213212,232123,2132123,21232123}
13 : {121232123}