# A047152 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 14
4 44
5 158
6 582
7 2068
8 7658
9 28365
10 106688
11 405144
12 1537720
13 5870813
14 22477625
15 86391408
16 333202409
17 1287571951
18 4986174232
19 19342971327
20 75166542530
21 292574047008
22 1140326119463
23 4449984515413
24 17384718120910