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A303449 as a simple table

na(n)
01
17
231
3127
4511
52047
68191
732767
8131071
9524287
10299593
118388607
1233554431
13134217727
14536870911
152147483647
168589934591
1734359738367
18137438953471
19549755813887
202199023255551
218796093022207
2235184372088831
23140737488355327
24562949953421311
252251799813685247

[1,7,31,127,511,2047,8191,32767,131071,524287,
 299593,8388607,33554431,134217727,536870911,
 2147483647,8589934591,34359738367,137438953471,
 549755813887,2199023255551,8796093022207,
 35184372088831,140737488355327,562949953421311,
 2251799813685247]