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A189923 as a simple table

na(n)
11
2-31
3-242
4-31
5-3124
67502
7-16806
8-31
9-242
1096844
11-161050
127502
13-371292
14520986
15756008
16-31
17-1419856
187502
19-2476098
2096844
214067052
224992550
23-6436342
247502
25-3124
2611510052
27-242
28520986
29-20511148
30-23436248

[1,-31,-242,-31,-3124,7502,-16806,-31,-242,96844,
 -161050,7502,-371292,520986,756008,-31,-1419856,
 7502,-2476098,96844,4067052,4992550,-6436342,7502,
 -3124,11510052,-242,520986,-20511148,-23436248]