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A241888 as a simple table

na(n)
01
131
2511
38191
4131071
52097151
633554431
7536870911
88589934591
9137438953471
102199023255551
1135184372088831
12562949953421311
139007199254740991
14144115188075855871
152305843009213693951
1636893488147419103231
17590295810358705651711
189444732965739290427391

[1,31,511,8191,131071,2097151,33554431,536870911,
 8589934591,137438953471,2199023255551,
 35184372088831,562949953421311,9007199254740991,
 144115188075855871,2305843009213693951,
 36893488147419103231,590295810358705651711,
 9444732965739290427391]