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) = 3, a(3) = 4.

Terms

a(0) =-1a(1) =2a(2) =3a(3) =4a(4) =11a(5) =13a(6) =32a(7) =41a(8) =89a(9) =122a(10) =243a(11) =349a(12) =656a(13) =973a(14) =1757a(15) =2666a(16) =4679a(17) =7217a(18) =12408a(19) =19369a(20) =32801a(21) =51658a(22) =86507a(23) =137141a(24) =227744a(25) =362837a(26) =598773a(27) =957514a(28) =1572671a(29) =2521993