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A009100 as a simple table

na(n)
01
1-2
216
3-328
411712
5-638720
649459840
7-5159926528
8697030680576
9-118233272496128
1024578235697610752
11-6139851821419921408
121813615341438397218816
13-624948457889265099014144

[1,-2,16,-328,11712,-638720,49459840,-5159926528,
 697030680576,-118233272496128,24578235697610752,
 -6139851821419921408,1813615341438397218816,
 -624948457889265099014144]