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A121926 as a simple table

na(n)
13
25
311
431
5131
6733
75057
840339
9362903
103628829
1139916831
12479001637
136227020841
1487178291243
151307674368047
1620922789888053
17355687428096059
186402373705728061
19121645100408832067
202432902008176640071
2151090942171709440073
221124000727777607680079

[3,5,11,31,131,733,5057,40339,362903,3628829,
 39916831,479001637,6227020841,87178291243,
 1307674368047,20922789888053,355687428096059,
 6402373705728061,121645100408832067,
 2432902008176640071,51090942171709440073,
 1124000727777607680079]