# A037539 (b-file synthesized from sequence entry)
1 1
2 8
3 49
4 295
5 1772
6 10633
7 63799
8 382796
9 2296777
10 13780663
11 82683980
12 496103881
13 2976623287
14 17859739724
15 107158438345
16 642950630071
17 3857703780428
18 23146222682569
19 138877336095415
20 833264016572492
21 4999584099434953