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A015685 as a simple table

na(n)
01
1-9
299
3-1287
419089
5-316305
65772195
7-114729615
82462398785
9-56674425465
101390839617475
11-36219350942775
12996780497137425
13-28887911103276225
14878916406742849475
15-27996927397669605375

[1,-9,99,-1287,19089,-316305,5772195,-114729615,
 2462398785,-56674425465,1390839617475,
 -36219350942775,996780497137425,
 -28887911103276225,878916406742849475,
 -27996927397669605375]