# A004370 (b-file synthesized from sequence entry)
2 1
3 21
4 378
5 6545
6 111930
7 1906884
8 32468436
9 553270671
10 9440350920
11 161322559475
12 2761025887620
13 47325339895743
14 812325612855848
15 13961746143269400
16 240260199935164200
17 4139207762053520646