a(n) = (2^(n+4)+1)*(2^n+1).

Terms

a(0) =34a(1) =99a(2) =325a(3) =1161a(4) =4369a(5) =16929a(6) =66625a(7) =264321a(8) =1052929a(9) =4203009a(10) =16794625a(11) =67143681a(12) =268505089a(13) =1073881089a(14) =4295245825a(15) =17180426241a(16) =68720590849a(17) =274880135169