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A108391 as a simple table

na(n)
01
1-1
23
33
41
517
617
7-1
867
967
101
11289
12289
13-1
141219
151219
161
175169
185169
19-1
2021891
2121891
221
2392737
2492737
25-1
26392835
27392835
281
291664081
301664081
31-1
327049155
337049155
341
3529860705
3629860705
37-1
38126491971
39126491971
401
41535828593
42535828593
43-1
442269806339
452269806339
461
479615053953

[1,-1,3,3,1,17,17,-1,67,67,1,289,289,-1,1219,1219,
 1,5169,5169,-1,21891,21891,1,92737,92737,-1,
 392835,392835,1,1664081,1664081,-1,7049155,
 7049155,1,29860705,29860705,-1,126491971,
 126491971,1,535828593,535828593,-1,2269806339,
 2269806339,1,9615053953]