Fibonacci(n)^3 + Fibonacci(n+2)^3.

Terms

a(0) =1a(1) =9a(2) =28a(3) =133a(4) =539a(5) =2322a(6) =9773a(7) =41501a(8) =175636a(9) =744273a(10) =3152359a(11) =13354306a(12) =56568617a(13) =239630337a(14) =1015087436a(15) =4299984173a(16) =18215017507a(17) =77160064914a(18) =326855259829