A Fibonacci convolution.

Terms

a(0) =0a(1) =1a(2) =3a(3) =7a(4) =18a(5) =48a(6) =126a(7) =329a(8) =861a(9) =2255a(10) =5904a(11) =15456a(12) =40464a(13) =105937a(14) =277347a(15) =726103a(16) =1900962a(17) =4976784a(18) =13029390a(19) =34111385a(20) =89304765a(21) =233802911a(22) =612103968a(23) =1602508992a(24) =4195423008a(25) =10983760033a(26) =28755857091a(27) =75283811239a(28) =197095576626