# A002570 (b-file synthesized from sequence entry)
1 1
2 1
3 6
4 11
5 36
6 85
7 235
8 600
9 1590
10 4140
11 10866
12 28416
13 74431
14 194821
15 510096
16 1335395
17 3496170
18 9153025
19 23963005
20 62735880
21 164244756
22 429998256
23 1125750156
24 2947252056
25 7716006181
26 20200766305
27 52886292930
28 138458112275
29 362488044120