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A213248 as a simple table

na(n)
11
23
37
415
531
663
7127
8255
9511
101023
112047
12315
138191
1416383
1532767
1665535
17131071
18262143
19524287
201048575
212097151
224194303
238388607
241290555
2533554431
2667108863
27134217727
28268435455
29536870911
301073741823
312147483647
324294967295
338589934591
3417179869183
3534359738367
365286113595

[1,3,7,15,31,63,127,255,511,1023,2047,315,8191,
 16383,32767,65535,131071,262143,524287,1048575,
 2097151,4194303,8388607,1290555,33554431,67108863,
 134217727,268435455,536870911,1073741823,
 2147483647,4294967295,8589934591,17179869183,
 34359738367,5286113595]