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A135630 as a simple table

na(n)
10
21
37
431
5511
62047
732767
8131071
92097151
10134217727
11536870911
1234359738367
13549755813887
142199023255551
1535184372088831
162251799813685247
17144115188075855871
18576460752303423487
1936893488147419103231
20590295810358705651711

[0,1,7,31,511,2047,32767,131071,2097151,134217727,
 536870911,34359738367,549755813887,2199023255551,
 35184372088831,2251799813685247,
 144115188075855871,576460752303423487,
 36893488147419103231,590295810358705651711]