Expansion of g.f. (1+8*x-x^2)/((1+x)*(1-6*x+x^2)).

Terms

a(0) =1a(1) =13a(2) =69a(3) =409a(4) =2377a(5) =13861a(6) =80781a(7) =470833a(8) =2744209a(9) =15994429a(10) =93222357a(11) =543339721a(12) =3166815961a(13) =18457556053a(14) =107578520349a(15) =627013566049