# A148471 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 19
5 67
6 261
7 1043
8 4339
9 18503
10 80384
11 354740
12 1585917
13 7161755
14 32631452
15 149791796
16 691983065
17 3214568803
18 15005803890
19 70346777076
20 331038719877
21 1563084382317
22 7402900834627
23 35156932411463
24 167377476828587
25 798660481273445
26 3818763850454642
27 18293807958359356
28 87789006215473697