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A206957 as a simple table

na(n)
13
29
39
425
581
625
769
8625
9625
1069
11191
124761
1311804
144761
15191
16529
1736481
18218637
19218637
2036481
21529
221465
23279841
244107593
259803278
264107593
27279841
281465
294057
302146225
3177359677
32449797912
33449797912
3477359677
352146225
364057
3711235

[3,9,9,25,81,25,69,625,625,69,191,4761,11804,4761,
 191,529,36481,218637,218637,36481,529,1465,279841,
 4107593,9803278,4107593,279841,1465,4057,2146225,
 77359677,449797912,449797912,77359677,2146225,
 4057,11235]