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A336819 as a simple table

na(n)
17
215
323
431
563
6127
7255
8511
91023
102047
114095
128191
1316383
1432767
1565535
16131071
17262143
18524287
191048575
202097151
214194303
228388607
2316777215
2433554431
2567108863
26134217727
27268435455
28536870911
291073741823
302147483647
314294967295
328589934591
3317179869183
3434359738367
3568719476735

[7,15,23,31,63,127,255,511,1023,2047,4095,8191,
 16383,32767,65535,131071,262143,524287,1048575,
 2097151,4194303,8388607,16777215,33554431,
 67108863,134217727,268435455,536870911,1073741823,
 2147483647,4294967295,8589934591,17179869183,
 34359738367,68719476735]