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A128210 as a simple table

na(n)
01
1-1
21
31
4-1
51
6-3
73
8-3
91
1015
11-15
1215
13-5
141
15-165
16165
17-165
1855
19-11
201
213465
22-3465
233465
24-1155
25231
26-21
271
28-148995
29148995
30-148995
3149665
32-9933
33903
34-43
351
3612664575
37-12664575
3812664575

[1,-1,1,1,-1,1,-3,3,-3,1,15,-15,15,-5,1,-165,165,
 -165,55,-11,1,3465,-3465,3465,-1155,231,-21,1,
 -148995,148995,-148995,49665,-9933,903,-43,1,
 12664575,-12664575,12664575]