a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = 0, a(2) = 1, a(3) = 1.

Terms

a(0) =-2a(1) =0a(2) =1a(3) =1a(4) =8a(5) =9a(6) =29a(7) =38a(8) =91a(9) =129a(10) =268a(11) =397a(12) =761a(13) =1158a(14) =2111a(15) =3269a(16) =5764a(17) =9033a(18) =15565a(19) =24598a(20) =41699a(21) =66297a(22) =111068a(23) =177365a(24) =294577a(25) =471942a(26) =778807a(27) =1250749a(28) =2054132a(29) =3304881