# A030873 (b-file synthesized from sequence entry)
1 1
2 2
3 7
4 31
5 156
6 936
7 6557
8 52457
9 472118
10 4721185
11 51933039
12 623196471
13 8101554127
14 113421757790
15 1701326366855
16 27221221869682
17 462760771784596
18 8329693892122733
19 158264183950331941
20 3165283679006638838