# A148980 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 32
5 112
6 416
7 1600
8 6303
9 25287
10 103015
11 425429
12 1777767
13 7500273
14 31915140
15 136814101
16 590457109
17 2563483906
18 11188928245
19 49072703877
20 216169809953
21 956076808622
22 4244091355887
23 18903499430285
24 84460316766813
25 378457183512630
26 1700378927500223
27 7658769324015511
28 34576775876824113