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A024088 as a simple table

na(n)
00
17
263
3511
44095
532767
6262143
72097151
816777215
9134217727
101073741823
118589934591
1268719476735
13549755813887
144398046511103
1535184372088831
16281474976710655
172251799813685247
1818014398509481983

[0,7,63,511,4095,32767,262143,2097151,16777215,
 134217727,1073741823,8589934591,68719476735,
 549755813887,4398046511103,35184372088831,
 281474976710655,2251799813685247,
 18014398509481983]