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A015693 as a simple table

na(n)
01
1-17
2323
3-6783
4155601
5-3861465
6102864195
7-2922828615
888124295105
9-2806906632705
1094095203991075
11-3309050756278575
12121731738138774225
13-4672861215811814025
14186756565415026882275
15-7755673484776330488375

[1,-17,323,-6783,155601,-3861465,102864195,
 -2922828615,88124295105,-2806906632705,
 94095203991075,-3309050756278575,
 121731738138774225,-4672861215811814025,
 186756565415026882275,-7755673484776330488375]