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A327497 as a simple table

na(n)
01
17
231
3127
473
52047
68191
74681
8131071
9524287
1042799
118388607
1233554431
1319173961
14536870911
152147483647
1653353631
171108378657
18137438953471
1978536544841
202199023255551
218796093022207
22162139963543
23140737488355327
24562949953421311
25321685687669321

[1,7,31,127,73,2047,8191,4681,131071,524287,42799,
 8388607,33554431,19173961,536870911,2147483647,
 53353631,1108378657,137438953471,78536544841,
 2199023255551,8796093022207,162139963543,
 140737488355327,562949953421311,321685687669321]