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A137470 as a simple table

na(n)
01
11
2-1
33
4-1
5-1
67
7-9
87
97
10-25
1139
12-25
13-25
14103
15-153
16103
17103
18-409
19615
20-409
21-409
221639
23-2457
241639
251639
26-6553
279831
28-6553
29-6553
3026215
31-39321
3226215
3326215
34-104857
35157287
36-104857
37-104857
38419431

[1,1,-1,3,-1,-1,7,-9,7,7,-25,39,-25,-25,103,-153,
 103,103,-409,615,-409,-409,1639,-2457,1639,1639,
 -6553,9831,-6553,-6553,26215,-39321,26215,26215,
 -104857,157287,-104857,-104857,419431]