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A009503 as a simple table

na(n)
01
1-1
2-7
3279
4-5167
5-150833
627945609
7-1993449433
8-9028140255
931838140005407
10-6048738288194407
11355913167525925303
12184225833048174255601
13-80356934978109379169297
1412759566239212806636543529

[1,-1,-7,279,-5167,-150833,27945609,-1993449433,
 -9028140255,31838140005407,-6048738288194407,
 355913167525925303,184225833048174255601,
 -80356934978109379169297,
 12759566239212806636543529]