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A060425 as a simple table

na(n)
13
231
3191
45119
5524287
63758096383
71618481116086271
85359447279004780799548150067050349330431
92817103802133904744169307240538184064530443801964688726052818649087

[3,31,191,5119,524287,3758096383,1618481116086271,
 5359447279004780799548150067050349330431,
 28171038021339047441693072405381840645304438019646\
 88726052818649087]