# A012462 (b-file synthesized from sequence entry)
0 0
1 2
2 -16
3 248
4 -3456
5 -164448
6 17537280
7 5001348480
8 -3047690956800
9 999150768960000
10 -194340969261158400
11 -28292890791044597760
12 48811395838790000148480
13 -15658656394130132870062080
14 -19215487887156327014813859840
15 37972554002174500707798919249920