# A197466 (b-file synthesized from sequence entry)
1 1
2 2
3 3
4 8
5 14
6 36
7 80
8 206
9 494
10 1259
11 3144
12 8085
13 20676
14 53635
15 139144
16 363630
17 952148
18 2504626
19 6603367
20 17463287