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

Terms

a(0) =1a(1) =3a(2) =6a(3) =18a(4) =51a(5) =147a(6) =423a(7) =1218a(8) =3507a(9) =10098a(10) =29076a(11) =83721a(12) =241065a(13) =694119a(14) =1998636a(15) =5754843a(16) =16570410a(17) =47712594a(18) =137382939a(19) =395578407a(20) =1139022627a(21) =3279684942a(22) =9443476419a(23) =27191406630a(24) =78294534948a(25) =225440128425a(26) =649128978645