a(n) = Fibonacci(n) - (Fibonacci(n) mod 2).

Terms

a(0) =0a(1) =0a(2) =0a(3) =2a(4) =2a(5) =4a(6) =8a(7) =12a(8) =20a(9) =34a(10) =54a(11) =88a(12) =144a(13) =232a(14) =376a(15) =610a(16) =986a(17) =1596a(18) =2584a(19) =4180a(20) =6764a(21) =10946a(22) =17710a(23) =28656a(24) =46368a(25) =75024a(26) =121392a(27) =196418a(28) =317810a(29) =514228