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

Terms

a(0) =1a(1) =-1a(2) =0a(3) =3a(4) =-9a(5) =18a(6) =-27a(7) =27a(8) =0a(9) =-81a(10) =243a(11) =-486a(12) =729a(13) =-729a(14) =0a(15) =2187a(16) =-6561a(17) =13122a(18) =-19683a(19) =19683a(20) =0a(21) =-59049a(22) =177147a(23) =-354294a(24) =531441a(25) =-531441a(26) =0a(27) =1594323a(28) =-4782969a(29) =9565938