a(n) = Fibonacci(n) - n^2.

Terms

a(0) =0a(1) =0a(2) =-3a(3) =-7a(4) =-13a(5) =-20a(6) =-28a(7) =-36a(8) =-43a(9) =-47a(10) =-45a(11) =-32a(12) =0a(13) =64a(14) =181a(15) =385a(16) =731a(17) =1308a(18) =2260a(19) =3820a(20) =6365a(21) =10505a(22) =17227a(23) =28128a(24) =45792a(25) =74400a(26) =120717a(27) =195689a(28) =317027a(29) =513388