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A012351 as a simple table

na(n)
01
10
2-12
3-240
4-1008
5378240
632163648
7-363487488
8-690754821888
9-145507353366528
10-11585562008128512
113150884675987558400
12573373842109571665920
13-1149448245885758287872000

[1,0,-12,-240,-1008,378240,32163648,-363487488,
 -690754821888,-145507353366528,-11585562008128512,
 3150884675987558400,573373842109571665920,
 -1149448245885758287872000]