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A326727 as a simple table

na(n)
1-1
2-1
3-1
4-1
5-1
6-5
7-691
8-7
9-3617
10-43867
11-283
12617
13-11
14131
15593
16-103
172294797
18-13
19657931
20-7
219349
22362903
23-5
241721
251001259881
26-37
27683
28305065927
29-17
30151628697551
31-26315271553053477373
32-19
33154210205991661
34-137616929
351897170067619

[-1,-1,-1,-1,-1,-5,-691,-7,-3617,-43867,-283,617,
 -11,131,593,-103,2294797,-13,657931,-7,9349,
 362903,-5,1721,1001259881,-37,683,305065927,-17,
 151628697551,-26315271553053477373,-19,
 154210205991661,-137616929,1897170067619]