# A026715 (b-file synthesized from sequence entry)
0 1
1 3
2 13
3 63
4 319
5 1647
6 8583
7 44941
8 235913
9 1240173
10 6524919
11 34346785
12 180855499
13 952494047
14 5017037457
15 26428222177
16 139223327493
17 733452042061
18 3864043260671
19 20357263645411
20 107251092223601
21 565050705077767