A Fibonacci convolution.

Terms

a(0) =1a(1) =2a(2) =5a(3) =14a(4) =37a(5) =96a(6) =251a(7) =658a(8) =1723a(9) =4510a(10) =11807a(11) =30912a(12) =80929a(13) =211874a(14) =554693a(15) =1452206a(16) =3801925a(17) =9953568a(18) =26058779a(19) =68222770a(20) =178609531a(21) =467605822a(22) =1224207935a(23) =3205017984a(24) =8390846017a(25) =21967520066a(26) =57511714181a(27) =150567622478