# A158827 (b-file synthesized from sequence entry)
1 1
2 4
3 20
4 110
5 640
6 3870
7 24084
8 153306
9 993978
10 6544242
11 43652340
12 294469974
13 2006018748
14 13784115468
15 95444016984
16 665407010349
17 4667570034444
18 32922870719664
19 233389493503968
20 1662048903052380
21 11885333877149532