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A183076 as a simple table

na(n)
163
21023
316383
432767
567108863
61073741823
717179869183
8274877906943
98796093022207
102251799813685247
114611686018427387903
1236893488147419103231

[63,1023,16383,32767,67108863,1073741823,
 17179869183,274877906943,8796093022207,
 2251799813685247,4611686018427387903,
 36893488147419103231]