# A097165 (b-file synthesized from sequence entry)
0 1
1 7
2 41
3 227
4 1221
5 6447
6 33601
7 173467
8 889181
9 4533287
10 23015961
11 116477907
12 587981941
13 2962279327
14 14900875121
15 74862289547
16 375743103501
17 1884442140567
18 9445117195081
19 47317211944387
20 236952563597861