# A045908 (b-file synthesized from sequence entry)
0 0
1 1
2 3
3 13
4 49
5 203
6 833
7 3533
8 15133
9 65891
10 289865
11 1288491
12 5774847
13 26076165
14 118501583
15 541605705
16 2487893725
17 11480052755
18 53188676889
19 247337349095
20 1154007818323
21 5400694067345
22 25345508567027
23 119251934995963
24 562414480094339
25 2658260322324013