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

Terms

a(0) =1a(1) =0a(2) =7a(3) =19a(4) =98a(5) =387a(6) =1685a(7) =7064a(8) =30043a(9) =127071a(10) =538594a(11) =2281015a(12) =9663353a(13) =40933296a(14) =173398367a(15) =734523803a(16) =3111498370a(17) =13180509531a(18) =55833549037a(19) =236514685384