# A047091 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 11
4 41
5 139
6 515
7 1871
8 7004
9 26191
10 99137
11 376300
12 1437105
13 5505203
14 21167781
15 81602665
16 315395985
17 1221558683
18 4740410605
19 18426590090
20 71736136773
21 279654633032
22 1091552835344
23 4265355947434
24 16684466516559