a(n) = Fibonacci(n) + 4.

Terms

a(0) =4a(1) =5a(2) =5a(3) =6a(4) =7a(5) =9a(6) =12a(7) =17a(8) =25a(9) =38a(10) =59a(11) =93a(12) =148a(13) =237a(14) =381a(15) =614a(16) =991a(17) =1601a(18) =2588a(19) =4185a(20) =6769a(21) =10950a(22) =17715a(23) =28661a(24) =46372a(25) =75029a(26) =121397a(27) =196422a(28) =317815a(29) =514233