# A149351 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 12
4 42
5 156
6 606
7 2394
8 9804
9 40802
10 172286
11 738337
12 3202001
13 14007442
14 61830248
15 275035783
16 1231198753
17 5544051454
18 25101208259
19 114181560904
20 521629518564
21 2392582352822
22 11013730776909
23 50866209238898
24 235645872490463
25 1094762614098767
26 5099330548197097
27 23810432651755219