# A002824 (b-file synthesized from sequence entry)
2 1
3 3
4 18
5 190
6 3285
7 88851
8 3640644
9 220674924
10 19427552055
11 2448107338105
12 436330306419678
13 108909970814260122
14 37752710546082668409
15 18044326480066641231855
16 11818118910855384843861960
17 10549135258779933616014791704
18 12772521057179994145518171256587