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

Terms

a(0) =1a(1) =-2a(2) =0a(3) =4a(4) =-4a(5) =-4a(6) =12a(7) =-4a(8) =-20a(9) =28a(10) =12a(11) =-68a(12) =44a(13) =92a(14) =-180a(15) =-4a(16) =364a(17) =-356a(18) =-372a(19) =1084a(20) =-340a(21) =-1828a(22) =2508a(23) =1148a(24) =-6164a(25) =3868a(26) =8460a(27) =-16196a(28) =-724a(29) =33116