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

Terms

a(0) =-1a(1) =-2a(2) =1a(3) =1a(4) =10a(5) =15a(6) =41a(7) =64a(8) =137a(9) =217a(10) =418a(11) =667a(12) =1213a(13) =1944a(14) =3413a(15) =5485a(16) =9410a(17) =15151a(18) =25585a(19) =41248a(20) =68881a(21) =111153a(22) =184130a(23) =297331a(24) =489653a(25) =791080a(26) =1297117a(27) =2096389a(28) =3426274a(29) =5539047