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A115388 as a simple table

na(n)
1-1
23
3-4
417
5-41
642
7-289
81171
9-1739
101753
11-19157
1219262
13-249251
14250241
15-249383
16200107
17-1696405
181700409
19-32239703
20161504821
21-161227687
22161479627
23-3708740681
243713590526
25-18545643343
2618566236531
27-55641506293
2855694623643
29-230529988171

[-1,3,-4,17,-41,42,-289,1171,-1739,1753,-19157,
 19262,-249251,250241,-249383,200107,-1696405,
 1700409,-32239703,161504821,-161227687,161479627,
 -3708740681,3713590526,-18545643343,18566236531,
 -55641506293,55694623643,-230529988171]