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A257935 as a simple table

na(n)
01
10
2-5
33
4-61
55
6-125
77
8-121
99
10-325
1111
12-17071
1313
14-35
1515
16-7697
1717
1836685
1919
20-177911
2121
22852995
2323
24-236396851
2525
268553025
2727
28-23749473209
2929
308615841061175
3131
32-7709321049377
3333
342577687858265
3535
36-26315271553088022793
3737

[1,0,-5,3,-61,5,-125,7,-121,9,-325,11,-17071,13,
 -35,15,-7697,17,36685,19,-177911,21,852995,23,
 -236396851,25,8553025,27,-23749473209,29,
 8615841061175,31,-7709321049377,33,2577687858265,
 35,-26315271553088022793,37]