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A124839 as a simple table

na(n)
11
2-2
32
4-1
5-2
610
7-30
876
9-173
10363
11-717
121363
13-2551
144797
15-9189
1618015
17-36008
1872725
19-146930
20294423
21-581758
221130231
23-2158552
244061201
25-7557522
2613983585
27-25872679
2848115364
29-90273986
30171186911

[1,-2,2,-1,-2,10,-30,76,-173,363,-717,1363,-2551,
 4797,-9189,18015,-36008,72725,-146930,294423,
 -581758,1130231,-2158552,4061201,-7557522,
 13983585,-25872679,48115364,-90273986,171186911]