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A006686 as a simple table

na(n)
12
2257
365537
42070241
5100006561
6435746497
7815730977
8832507937
91475795617
102579667841
114338014017
125110698017
136975822977
1416983628577
1517995718017
1625605764801
1732575757441
1837822859617
1937839636577
2054875880097

[2,257,65537,2070241,100006561,435746497,
 815730977,832507937,1475795617,2579667841,
 4338014017,5110698017,6975822977,16983628577,
 17995718017,25605764801,32575757441,37822859617,
 37839636577,54875880097]