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

Terms

a(0) =1a(1) =0a(2) =-1a(3) =-1a(4) =1a(5) =4a(6) =4a(7) =-3a(8) =-14a(9) =-15a(10) =9a(11) =49a(12) =56a(13) =-26a(14) =-171a(15) =-208a(16) =71a(17) =595a(18) =769a(19) =-176a(20) =-2064a(21) =-2831a(22) =354a(23) =7137a(24) =10381a(25) =-295a(26) =-24596a(27) =-37926a(28) =-2359a(29) =84464