# A012725 (b-file synthesized from sequence entry)
0 1
1 2
2 28
3 920
4 54416
5 5056288
6 678865856
7 124425704832
8 29873423298816
9 9104340085891584
10 3435702339713424384
11 1573394503700675106816
12 859935938676055185002496
13 553085284375423405752918016