# A099152 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 3
4 7
5 23
6 83
7 405
8 2113
9 12657
10 82297
11 596483
12 4698655
13 40071743
14 367854835
15 3622508685
16 38027715185
17 424060091065
18 5006620130753
19 62395131973755
20 818456924866815
21 11271715349614463