Expansion of (1+3*x+x^2)/((1+x+x^2)*(1+5*x+x^2)).

Terms

a(0) =1a(1) =-3a(2) =12a(3) =-57a(4) =275a(5) =-1320a(6) =6325a(7) =-30303a(8) =145188a(9) =-695637a(10) =3332999a(11) =-15969360a(12) =76513801a(13) =-366599643a(14) =1756484412a(15) =-8415822417a(16) =40322627675a(17) =-193197315960a(18) =925663952125