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) = 0, a(3) = 1.

Terms

a(0) =-2a(1) =1a(2) =0a(3) =1a(4) =3a(5) =4a(6) =11a(7) =15a(8) =34a(9) =49a(10) =99a(11) =148a(12) =279a(13) =427a(14) =770a(15) =1197a(16) =2095a(17) =3292a(18) =5643a(19) =8935a(20) =15090a(21) =24025a(22) =40139a(23) =64164a(24) =106351a(25) =170515a(26) =280962a(27) =451477a(28) =740631a(29) =1192108