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A009068 as a simple table

na(n)
01
1-1
2-15
3-513
4-31007
5-2881089
6-376412847
7-64825974593
8-13951231536191
9-3556538162237313
10-998391201911168335
11-261420586488162589057
12-14787500346745601332575
1386170769393986400590463039

[1,-1,-15,-513,-31007,-2881089,-376412847,
 -64825974593,-13951231536191,-3556538162237313,
 -998391201911168335,-261420586488162589057,
 -14787500346745601332575,
 86170769393986400590463039]