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

Terms

a(0) =1a(1) =1a(2) =4a(3) =11a(4) =32a(5) =92a(6) =265a(7) =763a(8) =2197a(9) =6326a(10) =18215a(11) =52448a(12) =151018a(13) =434839a(14) =1252069a(15) =3605189a(16) =10380728a(17) =29890115a(18) =86065156a(19) =247814740a(20) =713554105a(21) =2054597159a(22) =5915976737a(23) =17034376106a(24) =49048531159a(25) =141229616740a(26) =406654474114