Expansion of o.g.f. (1-x^2)/(1-x+x^4).

Terms

a(0) =1a(1) =1a(2) =0a(3) =0a(4) =-1a(5) =-2a(6) =-2a(7) =-2a(8) =-1a(9) =1a(10) =3a(11) =5a(12) =6a(13) =5a(14) =2a(15) =-3a(16) =-9a(17) =-14a(18) =-16a(19) =-13a(20) =-4a(21) =10a(22) =26a(23) =39a(24) =43a(25) =33a(26) =7a(27) =-32a(28) =-75a(29) =-108