# A002684 (b-file synthesized from sequence entry)
0 6
1 360
2 10080
3 259200
4 239500800
5 145297152000
6 15692092416000
7 16005934264320000
8 8515157028618240000
9 3372002183332823040000
10 4653363012999295795200000
11 8469120683658718347264000000