# A003017 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 3
4 28
5 605
6 9366
7 116767
8 1310408
9 15812505
10 263924650
11 6018875291
12 148630870092
13 3548481410773
14 82543469312318
15 2000101425252855
16 54347539111582096
17 1678367049470539697
18 56020955060945897298