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A294290 as a simple table

na(n)
01
1-1
21
3-1
425
5-241
61081
7-3361
868881
9-1288225
1011828881
11-69917761
121347298921
13-36402297361
14533785676425
15-4949573821921
1696936811739041
17-3274354780495681
1867608887254849441
19-885780921100074625
2018450482854023522361
21-718444927697360335921

[1,-1,1,-1,25,-241,1081,-3361,68881,-1288225,
 11828881,-69917761,1347298921,-36402297361,
 533785676425,-4949573821921,96936811739041,
 -3274354780495681,67608887254849441,
 -885780921100074625,18450482854023522361,
 -718444927697360335921]