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A012090 as a simple table

na(n)
01
1-3
257
3-2587
4217137
5-29025587
65664605801
7-1519556355275
8536514935904609
9-241225069255390307
10134580033555427233689
11-91237165395466088195963
1273877505225687035803070353
13-70425423338543411535873624467
1478071169657855750497737512497097

[1,-3,57,-2587,217137,-29025587,5664605801,
 -1519556355275,536514935904609,
 -241225069255390307,134580033555427233689,
 -91237165395466088195963,
 73877505225687035803070353,
 -70425423338543411535873624467,
 78071169657855750497737512497097]