a(n) = Fibonacci(n)*(Fibonacci(n) + 1).

Terms

a(0) =0a(1) =2a(2) =2a(3) =6a(4) =12a(5) =30a(6) =72a(7) =182a(8) =462a(9) =1190a(10) =3080a(11) =8010a(12) =20880a(13) =54522a(14) =142506a(15) =372710a(16) =975156a(17) =2552006a(18) =6679640a(19) =17484942a(20) =45771990a(21) =119825862a(22) =313697232a(23) =821252306a(24) =2150037792a(25) =5628825650a(26) =14736381842a(27) =38580227142a(28) =101004149532a(29) =264431978670