Expansion of (1-4*x+2*x^2)/(1-7*x+13*x^2-4*x^3).

Terms

a(0) =1a(1) =3a(2) =10a(3) =35a(4) =127a(5) =474a(6) =1807a(7) =6995a(8) =27370a(9) =107883a(10) =427351a(11) =1698458a(12) =6765175a(13) =26985675a(14) =107746282a(15) =430470899a(16) =1720537327a(17) =6878624730a(18) =27505271455a(19) =109996928003a(20) =439924466026