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A181565 as a simple table

na(n)
04
17
213
325
449
597
6193
7385
8769
91537
103073
116145
1212289
1324577
1449153
1598305
16196609
17393217
18786433
191572865
203145729
216291457
2212582913
2325165825
2450331649
25100663297
26201326593
27402653185
28805306369
291610612737
303221225473

[4,7,13,25,49,97,193,385,769,1537,3073,6145,12289,
 24577,49153,98305,196609,393217,786433,1572865,
 3145729,6291457,12582913,25165825,50331649,
 100663297,201326593,402653185,805306369,
 1610612737,3221225473]