# A174997 (b-file synthesized from sequence entry)
0 0
1 2
2 24
3 670
4 49104
5 9556612
6 4912086816
7 6644887923672
8 23608681537374780
9 220028639470801004558
10 5375052124451092722363120
11 344018604775369204515020274376
12 57670543415219994487318191998268528