# A012522 (b-file synthesized from sequence entry)
0 1
1 0
2 1
3 6
4 33
5 220
6 1857
7 18578
8 210497
9 2666808
10 37529089
11 581350110
12 9823649121
13 179778809236
14 3542606470977
15 74792059538282
16 1684263304319105
17 40298130761503344
18 1020885056930919937