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A045544 as a simple table

na(n)
13
25
315
417
551
685
7255
8257
9771
101285
113855
124369
1313107
1421845
1565535
1665537
17196611
18327685
19983055
201114129
213342387
225570645
2316711935
2416843009
2550529027
2684215045
27252645135
28286331153
29858993459
301431655765
314294967295

[3,5,15,17,51,85,255,257,771,1285,3855,4369,13107,
 21845,65535,65537,196611,327685,983055,1114129,
 3342387,5570645,16711935,16843009,50529027,
 84215045,252645135,286331153,858993459,1431655765,
 4294967295]