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A139464 as a simple table

na(n)
12
25
311
431
5129
6731
75053
840335
9362897
103628819
1139916821
12479001623
136227020825
1487178291227
151307674368029
1620922789888031
17355687428096033
186402373705728035
19121645100408832037
202432902008176640039

[2,5,11,31,129,731,5053,40335,362897,3628819,
 39916821,479001623,6227020825,87178291227,
 1307674368029,20922789888031,355687428096033,
 6402373705728035,121645100408832037,
 2432902008176640039]