# A009168 (b-file synthesized from sequence entry)
0 1
1 0
2 12
3 480
4 25872
5 2031360
6 227781312
7 34846855680
8 6932161765632
9 1724433365360640
10 521307469175442432
11 187630895361738301440
12 79180079598904589094912
13 38701262478049196612321280