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

Terms

a(0) =0a(1) =1a(2) =0a(3) =-2a(4) =-3a(5) =0a(6) =8a(7) =13a(8) =0a(9) =-34a(10) =-55a(11) =0a(12) =144a(13) =233a(14) =0a(15) =-610a(16) =-987a(17) =0a(18) =2584a(19) =4181a(20) =0a(21) =-10946a(22) =-17711a(23) =0a(24) =46368a(25) =75025a(26) =0a(27) =-196418a(28) =-317811a(29) =0