Expansion of (1-3*x+x^2)/(1-9*x+28*x^2-35*x^3+15*x^4-x^5).

Terms

a(0) =1a(1) =6a(2) =27a(3) =110a(4) =429a(5) =1637a(6) =6172a(7) =23104a(8) =86090a(9) =319792a(10) =1185305a(11) =4386331a(12) =16212913a(13) =59873834a(14) =220964744a(15) =815057639a(16) =3005282745a(17) =11077802256a(18) =40824723483a(19) =150424044413a(20) =554183037617