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A012499 as a simple table

na(n)
01
1-3
2-35
31729
4-12711
5-5819099
6581423349
726066838953
8-19485197470415
92379630157273805
10789057561743200397
11-445703452244142678255
1225928070972710765150345
1380008658408138506870433013

[1,-3,-35,1729,-12711,-5819099,581423349,
 26066838953,-19485197470415,2379630157273805,
 789057561743200397,-445703452244142678255,
 25928070972710765150345,
 80008658408138506870433013]