Expansion of x*(1 + x - 2*x^2) / ( 1 - 4*x^2 - x^4).

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =9a(6) =17a(7) =38a(8) =72a(9) =161a(10) =305a(11) =682a(12) =1292a(13) =2889a(14) =5473a(15) =12238a(16) =23184a(17) =51841a(18) =98209a(19) =219602a(20) =416020a(21) =930249a(22) =1762289a(23) =3940598a(24) =7465176a(25) =16692641a(26) =31622993a(27) =70711162a(28) =133957148a(29) =299537289