# A002921 (b-file synthesized from sequence entry)
0 1
1 12
2 132
3 1404
4 14652
5 151116
6 1546332
7 15734460
8 159425580
9 1609987708
10 16215457188
11 162961837500
12 1634743178420
13 16373484437340
14 163778159931180
15 1636328839130860