a(n) = (3-4*n)*F(2*n-2) + (4-7*n)*F(2*n-1).

Terms

a(0) =1a(1) =-3a(2) =-25a(3) =-112a(4) =-416a(5) =-1411a(6) =-4537a(7) =-14085a(8) =-42653a(9) =-126794a(10) =-371554a(11) =-1076423a(12) =-3089555a(13) =-8799207a(14) =-24897121a(15) =-70052356a(16) =-196151492a(17) =-546916555a(18) =-1519249933a(19) =-4206274089a(20) =-11611243109a(21) =-31967026718a(22) =-87796880710