# A007872 (b-file synthesized from sequence entry)
1 1
2 1
3 1
4 4
5 9
6 27
7 89
8 304
9 944
10 3259
11 11081
12 38044
13 132921
14 467771
15 1650279
16 5907280
17 21183657
18 76488912
19 277631065
20 1012588940
21 3707127319
22 13632296219
23 50292158921
24 186165033296
25 691181554768
26 2573423459611