# A075387 (b-file synthesized from sequence entry)
1 1
2 8
3 162
4 30720
5 562500
6 1693052928
7 5534208960
8 414571718246400
9 87954833872105200
10 121080960000000000000
11 34545810976783666560
12 1757453597218363858432819200
13 20403194639791728130329600