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A009693 as a simple table

na(n)
01
12
28
348
4-256
5-6656
6930816
7-94216192
89099706368
9-822565076992
1027885670498304
1120948024601608192
12-10620485000782413824
133800373452911396519936
14-1166459964091299721641984

[1,2,8,48,-256,-6656,930816,-94216192,9099706368,
 -822565076992,27885670498304,20948024601608192,
 -10620485000782413824,3800373452911396519936,
 -1166459964091299721641984]