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A012643 as a simple table

na(n)
01
11
2-15
3225
4-3423
558305
6-3367023
7750974497
8-195722347967
956832659001729
10-19485490128305615
118027995798338091873
12-3957958222909649739039
132309625363907160407164225

[1,1,-15,225,-3423,58305,-3367023,750974497,
 -195722347967,56832659001729,-19485490128305615,
 8027995798338091873,-3957958222909649739039,
 2309625363907160407164225]