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A175241 as a simple table

na(n)
381
425
535
681
775
8289
9105
1081
11155
121089
13135
14357
15315
164225
17657
18425
19279
201485
21321
22357
23635
2416641
25459
26825
27567
285265
29657
301155
311275
3266049
334641
341485
35939
361625
371705
381095
391143
4010449
411209
421281
431329
442275
451413
461485
472555
48263169

[81,25,35,81,75,289,105,81,155,1089,135,357,315,
 4225,657,425,279,1485,321,357,635,16641,459,825,
 567,5265,657,1155,1275,66049,4641,1485,939,1625,
 1705,1095,1143,10449,1209,1281,1329,2275,1413,
 1485,2555,263169]