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

Terms

a(0) =0a(1) =-2a(2) =11a(3) =-52a(4) =247a(5) =-1182a(6) =5664a(7) =-27140a(8) =130037a(9) =-623044a(10) =2985181a(11) =-14302860a(12) =68529120a(13) =-328342742a(14) =1573184591a(15) =-7537580212a(16) =36114716467a(17) =-173036002122a(18) =829065294144