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A290231 as a simple table

na(n)
01
13
25
315
427
563
687
7255
8495
91023
101887
114095
127103
1316383
1421887
1565535
16130815
17262143
18521727
191048575
202079743
214194303
228214527
2316777215
2432501759
2567108863
26123691007
27268435455
28465289215
291073741823
301431666687
314294967295
328589869055

[1,3,5,15,27,63,87,255,495,1023,1887,4095,7103,
 16383,21887,65535,130815,262143,521727,1048575,
 2079743,4194303,8214527,16777215,32501759,
 67108863,123691007,268435455,465289215,1073741823,
 1431666687,4294967295,8589869055]