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

Terms

a(0) =-2a(1) =-1a(2) =2a(3) =1a(4) =13a(5) =14a(6) =47a(7) =61a(8) =148a(9) =209a(10) =437a(11) =646a(12) =1243a(13) =1889a(14) =3452a(15) =5341a(16) =9433a(17) =14774a(18) =25487a(19) =40261a(20) =68308a(21) =108569a(22) =181997a(23) =290566a(24) =482803a(25) =773369a(26) =1276652a(27) =2050021a(28) =3367633a(29) =5417654