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A209534 as a simple table

na(n)
15
29
39
417
525
617
733
865
965
1033
1165
12193
13257
14193
1565
16129
17513
181025
191025
20513
21129
22257
231537
244097
256145
264097
271537
28257
29513
304097
3116385
3232769
3332769
3416385
354097
36513
371025
3812289
3965537
40196609
41262145
42196609
4365537
4412289
451025
462049
4732769

[5,9,9,17,25,17,33,65,65,33,65,193,257,193,65,129,
 513,1025,1025,513,129,257,1537,4097,6145,4097,
 1537,257,513,4097,16385,32769,32769,16385,4097,
 513,1025,12289,65537,196609,262145,196609,65537,
 12289,1025,2049,32769]