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A304980 as a simple table

na(n)
1-2
27
3-77
41657
5-58457
63056557
7-221729237
821295269457
9-2614745018417
10399460073350357
11-74300372446261997
1216529958050063939257
13-4333993989483331875977
141322511243007573825356157
15-464663077436832702395156357
16186233354336664458732835601057

[-2,7,-77,1657,-58457,3056557,-221729237,
 21295269457,-2614745018417,399460073350357,
 -74300372446261997,16529958050063939257,
 -4333993989483331875977,1322511243007573825356157,
 -464663077436832702395156357,
 186233354336664458732835601057]