a(n) = 2^a(n-1) + a(n-2).A000659a(n) = 2^a(n-1) + a(n-2).Terms a(0) =0a(1) =0a(2) =1a(3) =2a(4) =5a(5) =34a(6) =17179869189External referencesoeis: A000659