Convolution of Fibonacci(n-1) and 3^n.

Terms

a(0) =1a(1) =3a(2) =10a(3) =31a(4) =95a(5) =288a(6) =869a(7) =2615a(8) =7858a(9) =23595a(10) =70819a(11) =212512a(12) =637625a(13) =1913019a(14) =5739290a(15) =17218247a(16) =51655351a(17) =154967040a(18) =464902717a(19) =1394710735a(20) =4184136386a(21) =12552415923a(22) =37657258715a(23) =112971793856a(24) =338915410225