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

Terms

a(0) =1a(1) =-2a(2) =1a(3) =2a(4) =-5a(5) =4a(6) =3a(7) =-12a(8) =13a(9) =2a(10) =-27a(11) =38a(12) =-9a(13) =-56a(14) =103a(15) =-56a(16) =-103a(17) =262a(18) =-215a(19) =-150a(20) =627a(21) =-692a(22) =-85a(23) =1404a(24) =-2011a(25) =522a(26) =2893a(27) =-5426a(28) =3055a(29) =5264