# A037499 (b-file synthesized from sequence entry)
1 1
2 6
3 38
4 229
5 1374
6 8246
7 49477
8 296862
9 1781174
10 10687045
11 64122270
12 384733622
13 2308401733
14 13850410398
15 83102462390
16 498614774341
17 2991688646046
18 17950131876278
19 107700791257669
20 646204747546014
21 3877228485276086