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A290297 as a simple table

na(n)
01
13
25
315
419
563
671
7255
8463
91023
101567
114095
124927
1316383
1416511
1565535
16130303
17262143
18516607
191048575
202044927
214194303
227866367
2316777215
2430396415
2567108863
26102637567
27268435455
28322125823
291073741823
301073774591
314294967295
328589737983

[1,3,5,15,19,63,71,255,463,1023,1567,4095,4927,
 16383,16511,65535,130303,262143,516607,1048575,
 2044927,4194303,7866367,16777215,30396415,
 67108863,102637567,268435455,322125823,1073741823,
 1073774591,4294967295,8589737983]