# A002630 (b-file synthesized from sequence entry)
1 0
2 0
3 0
4 1
5 2
6 12
7 71
8 481
9 3708
10 32028
11 306723
12 3228804
13 37080394
14 461569226
15 6192527700
16 89102492915
17 1369014167140
18 22373840093040
19 387602212164321
20 7095737193164187
21 136885937242792752
22 2775675888994318366