# A075908 (b-file synthesized from sequence entry)
0 1
1 60
2 2240
3 67200
4 1779456
5 43545600
6 1010606080
7 22600089600
8 492077121536
9 10505429975040
10 221005133905920
11 4597756408627200
12 94837435443183616
13 1943344895628410880
14 39618196941842677760