# A002571 (b-file synthesized from sequence entry)
1 1
2 5
3 10
4 30
5 74
6 199
7 515
8 1355
9 3540
10 9276
11 24276
12 63565
13 166405
14 435665
15 1140574
16 2986074
17 7817630
18 20466835
19 53582855
20 140281751
21 367262376
22 961505400
23 2517253800
24 6590256025
25 17253514249
26 45170286749
27 118257345970