# A047128 (b-file synthesized from sequence entry)
0 1
1 4
2 15
3 56
4 211
5 798
6 3030
7 11550
8 44193
9 169652
10 653158
11 2521038
12 9752516
13 37802636
14 146792136
15 570924940
16 2223730395
17 8672669484
18 33864089798
19 132372227670
20 517947357111
21 2028479976186
22 7950990968079
23 31189593428478