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A299776 as a simple table

na(n)
00
11
25
39
421
525
637
749
877
989
10101
11113
12141
13161
14189
15225
16293
17329
18341
19353
20381
21401
22429
23465
24533
25577
26605
27641
28709
29777
30853
31945
321101
331209
341237
351249
361277
371297
381325
391361
401429
411473
421501
431537
441605
451673
461749
471841
481997
492113
502157

[0,1,5,9,21,25,37,49,77,89,101,113,141,161,189,
 225,293,329,341,353,381,401,429,465,533,577,605,
 641,709,777,853,945,1101,1209,1237,1249,1277,1297,
 1325,1361,1429,1473,1501,1537,1605,1673,1749,1841,
 1997,2113,2157]