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A177960 as a simple table

na(n)
13
25
317
451
5257
61285
73855
813107
965537
10196611
11983055
121114129
135570645
1416711935
1550529027
1684215045
17858993459
184294967297
1921474836485
20219043332147
21365072220245
221103806595329
233311419785987

[3,5,17,51,257,1285,3855,13107,65537,196611,
 983055,1114129,5570645,16711935,50529027,84215045,
 858993459,4294967297,21474836485,219043332147,
 365072220245,1103806595329,3311419785987]