# A084915 (b-file synthesized from sequence entry)
0 0
1 1
2 8
3 108
4 2304
5 72000
6 3110400
7 177811200
8 13005619200
9 1185137049600
10 131681894400000
11 17526860144640000
12 2753310393630720000
13 504085244567224320000