a(n) = a(n - 1) - 2*a(n - 2) + a(n - 3) - 4*a(n - 4) + 2*a(n - 5).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =-2a(6) =-5a(7) =-2a(8) =4a(9) =13a(10) =19a(11) =-5a(12) =-50a(13) =-65a(14) =-20a(15) =118a(16) =283a(17) =187a(18) =-311a(19) =-914a(20) =-1001a(21) =334a(22) =3040a(23) =4405a(24) =835a(25) =-8273a(26) =-17030a(27) =-11189a(28) =20068a(29) =60178