# A148481 (b-file synthesized from sequence entry)
0 1
1 1
2 2
3 6
4 20
5 73
6 272
7 1040
8 4177
9 17264
10 72861
11 311631
12 1349356
13 5922851
14 26295985
15 117817978
16 531665582
17 2415053676
18 11040435677
19 50762362640
20 234552661491
21 1088404398909
22 5070457777960
23 23708810322816
24 111236246629822
25 523484373005358
26 2470328346542832
27 11687294570928665
28 55425802377348044