# A153941 (b-file synthesized from sequence entry)
0 1
1 2
2 2
3 3
4 8
5 18
6 64
7 323
8 1239
9 7677
10 70851
11 462347
12 4699837
13 77982415
14 865056340
15 15519583779
16 437728798867
17 8808271045842
18 278977031301418