a(n) = 2^(p-1)*(2^p-1) where p is prime(n).

A060286

a(n) = 2^(p-1)*(2^p-1) where p is prime(n).

Terms

    a(0) =6a(1) =28a(2) =496a(3) =8128a(4) =2096128a(5) =33550336a(6) =8589869056a(7) =137438691328

External references