# A019487 (b-file synthesized from sequence entry)
0 2
1 6
2 17
3 48
4 135
5 379
6 1064
7 2987
8 8385
9 23538
10 66075
11 185483
12 520680
13 1461631
14 4103029
15 11517850
16 32332423
17 90762215
18 254783864
19 715218523
20 2007731289
21 5636018642
22 15821193955
23 44412588755
24 124673147016
25 349977202919