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A012692 as a simple table

na(n)
01
1-1
225
3-1057
481905
5-10280289
61887120585
7-476966767617
8158890850697185
9-67468163508862017
1035571148438980847225
11-22799419589275221917281
1217459463801481355245128145

[1,-1,25,-1057,81905,-10280289,1887120585,
 -476966767617,158890850697185,-67468163508862017,
 35571148438980847225,-22799419589275221917281,
 17459463801481355245128145]