# A047039 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 22
4 126
5 751
6 4595
7 28514
8 179277
9 1136405
10 7256229
11 46583010
12 300438175
13 1944986187
14 12632217312
15 82269089182
16 537071072123
17 3513452296105
18 23026993173298
19 151165338147804
20 993811676366531
21 6542280703133297