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A287057 as a simple table

na(n)
13
29
321
435
555
677
7105
8135
9171
10209
11253
12299
13351
14405
15465
16527
17595
18665
19741
20819
21903
22989
231081
241175
251275
261377
271485
281595
291711
301829
311953
322079
332211
342345
352485
362627
372775
382925
393081
403239
413403
423569
433741
443915
454095

[3,9,21,35,55,77,105,135,171,209,253,299,351,405,
 465,527,595,665,741,819,903,989,1081,1175,1275,
 1377,1485,1595,1711,1829,1953,2079,2211,2345,2485,
 2627,2775,2925,3081,3239,3403,3569,3741,3915,4095]