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A273672 as a simple table

na(n)
11
23
37
415
531
663
7127
82
9511
101023
112047
124095
138191
1416383
1532767
1665535
17131071
18262143
19524287
201048575
212097151
224194303
238388607
246
2533554431
2667108863
274
28268435455
29536870911
301073741823
312147483647
32128
338589934591
3417179869183
3534359738367
3668719476735
37137438953471
38274877906943
39549755813887
4014

[1,3,7,15,31,63,127,2,511,1023,2047,4095,8191,
 16383,32767,65535,131071,262143,524287,1048575,
 2097151,4194303,8388607,6,33554431,67108863,4,
 268435455,536870911,1073741823,2147483647,128,
 8589934591,17179869183,34359738367,68719476735,
 137438953471,274877906943,549755813887,14]