# A153936 (b-file synthesized from sequence entry)
0 1
1 2
2 4
3 13
4 26
5 65
6 226
7 1291
8 7132
9 55130
10 379228
11 4264780
12 44700351
13 743555327
14 11220972023
15 261784540652
16 5859844173065
17 202299825940682
18 6575351187836482