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A012347 as a simple table

na(n)
00
12
28
3-112
4-8832
5-269568
618508800
74584990720
8373223424000
9-57291983093760
10-29502109561651200
11-4280300758758850560
121571738277174218588160
131306880625182819525591040

[0,2,8,-112,-8832,-269568,18508800,4584990720,
 373223424000,-57291983093760,-29502109561651200,
 -4280300758758850560,1571738277174218588160,
 1306880625182819525591040]