# A149410 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 52
5 197
6 887
7 3686
8 17039
9 74498
10 350257
11 1580535
12 7514894
13 34622615
14 165947569
15 775826792
16 3740678741
17 17676527734
18 85615386144
19 407871219683
20 1982550001834
21 9504673256898
22 46331928211929
23 223240994258588
24 1090772943473217
25 5277092832609988
26 25834617528759960
27 125405601347310656