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

Terms

a(0) =1a(1) =-2a(2) =1a(3) =3a(4) =-8a(5) =7a(6) =7a(7) =-30a(8) =37a(9) =7a(10) =-104a(11) =171a(12) =-53a(13) =-326a(14) =721a(15) =-501a(16) =-872a(17) =2815a(18) =-2945a(19) =-1614a(20) =10189a(21) =-14465a(22) =1048a(23) =33795a(24) =-63773a(25) =32074a(26) =99289a(27) =-258909a(28) =223768a(29) =233719