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A012343 as a simple table

na(n)
02
18
2-112
3-8832
4-27648
571731200
68459581440
7-999488716800
8-609228538183680
9-30947990077440000
1082287312014325841920
1135793618716907672698880
12-9141042424973375790120960

[2,8,-112,-8832,-27648,71731200,8459581440,
 -999488716800,-609228538183680,-30947990077440000,
 82287312014325841920,35793618716907672698880,
 -9141042424973375790120960]