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A097074 as a simple table

na(n)
01
11
25
39
421
541
685
7169
8341
9681
101365
112729
125461
1310921
1421845
1543689
1687381
17174761
18349525
19699049
201398101
212796201
225592405
2311184809
2422369621
2544739241
2689478485
27178956969
28357913941
29715827881
301431655765
312863311529

[1,1,5,9,21,41,85,169,341,681,1365,2729,5461,
 10921,21845,43689,87381,174761,349525,699049,
 1398101,2796201,5592405,11184809,22369621,
 44739241,89478485,178956969,357913941,715827881,
 1431655765,2863311529]