Expansion of (1+x)*(1-x)/(1 - x + x^2 + x^3).

Terms

a(0) =1a(1) =1a(2) =-1a(3) =-3a(4) =-3a(5) =1a(6) =7a(7) =9a(8) =1a(9) =-15a(10) =-25a(11) =-11a(12) =29a(13) =65a(14) =47a(15) =-47a(16) =-159a(17) =-159a(18) =47a(19) =365a(20) =477a(21) =65a(22) =-777a(23) =-1319a(24) =-607a(25) =1489a(26) =3415a(27) =2533a(28) =-2371a(29) =-8319