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A023394 as a simple table

na(n)
13
25
317
4257
5641
665537
7114689
8274177
9319489
10974849
112424833
126700417
1313631489
1426017793
1545592577
1663766529
17167772161
18825753601
191214251009
206487031809
2170525124609
22190274191361
23646730219521
242710954639361
252748779069441
264485296422913
276597069766657

[3,5,17,257,641,65537,114689,274177,319489,974849,
 2424833,6700417,13631489,26017793,45592577,
 63766529,167772161,825753601,1214251009,
 6487031809,70525124609,190274191361,646730219521,
 2710954639361,2748779069441,4485296422913,
 6597069766657]