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A051048 as a simple table

na(n)
12
25
331
4449
56271
687361
71216799
816947841
9236052991
103287794049
1145793063711
12637815097921
138883618307199
14123732841202881
151723376158533151
1624003533378261249
17334326091137124351

[2,5,31,449,6271,87361,1216799,16947841,236052991,
 3287794049,45793063711,637815097921,8883618307199,
 123732841202881,1723376158533151,
 24003533378261249,334326091137124351]