# A055531 (b-file synthesized from sequence entry)
2 2
3 12
4 86
5 840
6 11642
7 227892
8 6285806
9 243593040
10 13262556722
11 1014466283292
12 109128015915206
13 16521353903210520
14 3524056001906654762
15 1059868947134489801412
16 449831067019305308555486
17 269568708630308018001547680
18 228228540531327778410439620962