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A046239 as a simple table

na(n)
10
21
33
49
565
673
7513
84097
94161
1032769
11262145
12262657
132097153
1416777217
1516781313
16134217729
171073741825
181073774593
198589934593
2068719476737
2168719738881

[0,1,3,9,65,73,513,4097,4161,32769,262145,262657,
 2097153,16777217,16781313,134217729,1073741825,
 1073774593,8589934593,68719476737,68719738881]