# A149425 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 13
4 42
5 146
6 520
7 1893
8 6928
9 25520
10 95258
11 357332
12 1348314
13 5109674
14 19419422
15 74124571
16 283750244
17 1089053340
18 4189218564
19 16143369610
20 62342218516
21 241154261642
22 934254937426
23 3624326380994
24 14076738707662
25 54742699821140
26 213116870712502
27 830503102890218
28 3239368922556944