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A294134 as a simple table

na(n)
13
217
353
497
5257
6449
72417
87681
98513
1065537
1189633
12114689
13339121
14876097
151321729
161454081
172572289
184638721
195463041
207340033
2127688961
2247047681
2362177153
2493847553
25113418241
26374734849
273731619841
2813037142017
2913555990529
3013951408129
31142807662593

[3,17,53,97,257,449,2417,7681,8513,65537,89633,
 114689,339121,876097,1321729,1454081,2572289,
 4638721,5463041,7340033,27688961,47047681,
 62177153,93847553,113418241,374734849,3731619841,
 13037142017,13555990529,13951408129,142807662593]