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A012462 as a simple table

na(n)
00
12
2-16
3248
4-3456
5-164448
617537280
75001348480
8-3047690956800
9999150768960000
10-194340969261158400
11-28292890791044597760
1248811395838790000148480
13-15658656394130132870062080
14-19215487887156327014813859840
1537972554002174500707798919249920

[0,2,-16,248,-3456,-164448,17537280,5001348480,
 -3047690956800,999150768960000,
 -194340969261158400,-28292890791044597760,
 48811395838790000148480,
 -15658656394130132870062080,
 -19215487887156327014813859840,
 37972554002174500707798919249920]