A Fibonacci convolution.

Terms

a(0) =0a(1) =1a(2) =2a(3) =7a(4) =16a(5) =46a(6) =114a(7) =309a(8) =792a(9) =2101a(10) =5456a(11) =14356a(12) =37468a(13) =98281a(14) =256998a(15) =673323a(16) =1761984a(17) =4614226a(18) =12078110a(19) =31624285a(20) =82787980a(21) =216750601a(22) =567446112a(23) =1485616392a(24) =3889356696a(25) =10182528721a(26) =26658108074a(27) =69791991919a(28) =182717549872