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A076723 as a simple table

na(n)
1-1
23
3-28
4259
5-3126
646632
7-823544
816777475
9-387420517
109999996878
11-285311670612
128916100495144
13-302875106592254
1411112006824734476
15-437893890380862528
1618446744073726329091
17-827240261886336764178
1839346408075296150201567

[-1,3,-28,259,-3126,46632,-823544,16777475,
 -387420517,9999996878,-285311670612,8916100495144,
 -302875106592254,11112006824734476,
 -437893890380862528,18446744073726329091,
 -827240261886336764178,39346408075296150201567]