a(n) = -a(n-1) + 7*a(n-2) + 3*a(n-3) with a(0) = a(1) = 0, a(2) = 1.

Terms

a(0) =0a(1) =0a(2) =1a(3) =-1a(4) =8a(5) =-12a(6) =65a(7) =-125a(8) =544a(9) =-1224a(10) =4657a(11) =-11593a(12) =40520a(13) =-107700a(14) =356561a(15) =-988901a(16) =3161728a(17) =-9014352a(18) =28179745a(19) =-81795025a(20) =252010184a(21) =-740036124a(22) =2258722337a(23) =-6682944653a(24) =20273892640a(25) =-60278338200a(26) =182146752721a(27) =-543273442201