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A225855 as a simple table

na(n)
1-1
2-1
33
4-1
55
69
7-7
8-1
927
1025
1111
12162
1313
1449
15521
16-1
17697
182196
1919
20625
218435
22121
23-23
2459049
253120
26169
27177147
282401
2929
30982635
31-237367
32-1
333958307
34781745
35121691
3628697814
3737
38361
3989405461
401953125

[-1,-1,3,-1,5,9,-7,-1,27,25,11,162,13,49,521,-1,
 697,2196,19,625,8435,121,-23,59049,3120,169,
 177147,2401,29,982635,-237367,-1,3958307,781745,
 121691,28697814,37,361,89405461,1953125]