a(n) = Fibonacci(n)^3 + Fibonacci(n+1)^3.

Terms

a(0) =1a(1) =2a(2) =9a(3) =35a(4) =152a(5) =637a(6) =2709a(7) =11458a(8) =48565a(9) =205679a(10) =871344a(11) =3690953a(12) =15635321a(13) =66231970a(14) =280563633a(15) =1188485803a(16) =5034507976a(17) =21326515877a(18) =90340574445a(19) =382688808866