# A153933 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 13
4 26
5 135
6 581
7 5081
8 33999
9 455470
10 5028919
11 110445068
12 1936072745
13 69174531647
14 1977766145879
15 114385090415133
16 5299105178883837
17 494911099658091565
18 37117101455488584937