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A126284 as a simple table

na(n)
11
27
323
459
5135
6291
7607
81243
92519
105075
1110191
1220427
1340903
1481859
15163775
16327611
17655287
181310643
192621359
205242795
2110485671
2220971427
2341942943
2483885979
25167772055
26335544211
27671088527
281342177163
292684354439

[1,7,23,59,135,291,607,1243,2519,5075,10191,20427,
 40903,81859,163775,327611,655287,1310643,2621359,
 5242795,10485671,20971427,41942943,83885979,
 167772055,335544211,671088527,1342177163,
 2684354439]