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

Terms

a(0) =0a(1) =-1a(2) =2a(3) =1a(4) =9a(5) =10a(6) =31a(7) =41a(8) =96a(9) =137a(10) =281a(11) =418a(12) =795a(13) =1213a(14) =2200a(15) =3413a(16) =5997a(17) =9410a(18) =16175a(19) =25585a(20) =43296a(21) =68881a(22) =115249a(23) =184130a(24) =305523a(25) =489653a(26) =807464a(27) =1297117a(28) =2129157a(29) =3426274