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A213243 as a simple table

na(n)
11
21
37
45
531
621
7127
885
9511
10341
112047
121365
138191
145461
1532767
1621845
17131071
1887381
19524287
20349525
212097151
221398101
238388607
245592405
2533554431
2622369621
27134217727
2889478485
29536870911
30357913941
312147483647
321431655765
338589934591
345726623061
3534359738367
3622906492245

[1,1,7,5,31,21,127,85,511,341,2047,1365,8191,5461,
 32767,21845,131071,87381,524287,349525,2097151,
 1398101,8388607,5592405,33554431,22369621,
 134217727,89478485,536870911,357913941,2147483647,
 1431655765,8589934591,5726623061,34359738367,
 22906492245]