Convolution of Fibonacci(n) and 3^n.

Terms

a(0) =0a(1) =1a(2) =4a(3) =14a(4) =45a(5) =140a(6) =428a(7) =1297a(8) =3912a(9) =11770a(10) =35365a(11) =106184a(12) =318696a(13) =956321a(14) =2869340a(15) =8608630a(16) =25826877a(17) =77482228a(18) =232449268a(19) =697351985a(20) =2092062720a(21) =6276199106a(22) =18828615029a(23) =56485873744a(24) =169457667600a(25) =508373077825