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

Terms

a(0) =1a(1) =5a(2) =21a(3) =83a(4) =319a(5) =1208a(6) =4535a(7) =16932a(8) =62986a(9) =233702a(10) =865513a(11) =3201026a(12) =11826582a(13) =43660921a(14) =161090910a(15) =594092895a(16) =2190225106a(17) =8072519511a(18) =29746921227a(19) =109599320930a(20) =403758993204