# A037592 (b-file synthesized from sequence entry)
1 1
2 6
3 39
4 235
5 1410
6 8463
7 50779
8 304674
9 1828047
10 10968283
11 65809698
12 394858191
13 2369149147
14 14214894882
15 85289369295
16 511736215771
17 3070417294626
18 18422503767759
19 110535022606555
20 663210135639330
21 3979260813835983