Sum of divisors of 2^prime(n)+1.

Terms

a(0) =6a(1) =13a(2) =48a(3) =176a(4) =2736a(5) =10928a(6) =174768a(7) =699056a(8) =11184816a(9) =727960800a(10) =2863311536a(11) =183355069408