# A016137 (b-file synthesized from sequence entry)
0 1
1 9
2 63
3 405
4 2511
5 15309
6 92583
7 557685
8 3352671
9 20135709
10 120873303
11 725416965
12 4353033231
13 26119793709
14 156723545223
15 940355620245
16 5642176768191
17 33853189749309
18 203119525916343
19 1218718317759525