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A118408 as a simple table

na(n)
01
11
2-1
31
41
5-1
63
7-3
81
97
10-13
1113
121
13-25
1451
15-51
161
17103
18-205
19205
201
21-409
22819
23-819
241
251639
26-3277
273277
281
29-6553
3013107
31-13107
321
3326215
34-52429
3552429
361
37-104857
38209715
39-209715
401
41419431
42-838861
43838861
441
45-1677721
463355443
47-3355443
481
496710887
50-13421773
5113421773
521

[1,1,-1,1,1,-1,3,-3,1,7,-13,13,1,-25,51,-51,1,103,
 -205,205,1,-409,819,-819,1,1639,-3277,3277,1,
 -6553,13107,-13107,1,26215,-52429,52429,1,-104857,
 209715,-209715,1,419431,-838861,838861,1,-1677721,
 3355443,-3355443,1,6710887,-13421773,13421773,1]