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A360751 as a simple table

na(n)
14
29
364
4-1
5144
6625
7324
82601
9-1
10154449
11260100
121681
13898704
1427225
15114244
16-1
17278784
18223729
194410000
2025281
2112888100
224730625
231512900
244774225
25-1
268208225
276130576
281121481
2912744900
3034586161
312433600
3245360225
339784384
341271279025
3564064016
36-1
3769956496

[4,9,64,-1,144,625,324,2601,-1,154449,260100,1681,
 898704,27225,114244,-1,278784,223729,4410000,
 25281,12888100,4730625,1512900,4774225,-1,8208225,
 6130576,1121481,12744900,34586161,2433600,
 45360225,9784384,1271279025,64064016,-1,69956496]