# A037483 (b-file synthesized from sequence entry)
1 1
2 8
3 49
4 296
5 1777
6 10664
7 63985
8 383912
9 2303473
10 13820840
11 82925041
12 497550248
13 2985301489
14 17911808936
15 107470853617
16 644825121704
17 3868950730225
18 23213704381352
19 139282226288113
20 835693357728680
21 5014160146372081