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

Terms

a(0) =1a(1) =3a(2) =4a(3) =1a(4) =-4a(5) =-3a(6) =8a(7) =17a(8) =4a(9) =-27a(10) =-32a(11) =25a(12) =92a(13) =45a(14) =-136a(15) =-223a(16) =52a(17) =501a(18) =400a(19) =-599a(20) =-1396a(21) =-195a(22) =2600a(23) =2993a(24) =-2204a(25) =-8187a(26) =-3776a(27) =12601a(28) =20156a(29) =-5043