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A207989 as a simple table

na(n)
13
29
39
425
581
625
769
8625
9625
1069
11191
124761
1312468
144761
15191
16529
1736481
18244325
19244325
2036481
21529
221465
23279841
244827482
2512271227
264827482
27279841
281465
294057
302146225
3195527856
32622569385
33622569385
3495527856
352146225
364057
3711235

[3,9,9,25,81,25,69,625,625,69,191,4761,12468,4761,
 191,529,36481,244325,244325,36481,529,1465,279841,
 4827482,12271227,4827482,279841,1465,4057,2146225,
 95527856,622569385,622569385,95527856,2146225,
 4057,11235]