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A294133 as a simple table

na(n)
17
217
329
497
5193
6257
7641
812289
922993
1065537
11102593
12115201
13152833
14211457
15993793
165189633
1726411009
1879280897
1993847553
20167772161
21230686721
221364951041
231573071713
243221225473
255488091137
26186678460417
27206158430209
28274568286337

[7,17,29,97,193,257,641,12289,22993,65537,102593,
 115201,152833,211457,993793,5189633,26411009,
 79280897,93847553,167772161,230686721,1364951041,
 1573071713,3221225473,5488091137,186678460417,
 206158430209,274568286337]