# A000663 (b-file synthesized from sequence entry)
0 1
1 2
2 9
3 37
4 183
5 933
6 5314
7 32043
8 207212
9 1415934
10 10200289
11 77018442
12 607474564
13 4987909231
14 42519634303
15 375395726926