G.f.: 1/(1 + x + 2*x^2 + 2*x^3 + x^4).

Terms

a(0) =1a(1) =-1a(2) =-1a(3) =1a(4) =2a(5) =-1a(6) =-4a(7) =1a(8) =7a(9) =0a(10) =-12a(11) =-3a(12) =20a(13) =10a(14) =-32a(15) =-25a(16) =49a(17) =55a(18) =-71a(19) =-112a(20) =95a(21) =216a(22) =-111a(23) =-399a(24) =94a(25) =710a(26) =11a(27) =-1220a(28) =-316a(29) =2024