floor[2^n/Fibonacci(n)].

Terms

a(0) =2a(1) =4a(2) =4a(3) =5a(4) =6a(5) =8a(6) =9a(7) =12a(8) =15a(9) =18a(10) =23a(11) =28a(12) =35a(13) =43a(14) =53a(15) =66a(16) =82a(17) =101a(18) =125a(19) =155a(20) =191a(21) =236a(22) =292a(23) =361a(24) =447a(25) =552a(26) =683a(27) =844a(28) =1044a(29) =1290