Expansion of (1-4*x)/(1-5*x-x^2).

Terms

a(0) =1a(1) =1a(2) =6a(3) =31a(4) =161a(5) =836a(6) =4341a(7) =22541a(8) =117046a(9) =607771a(10) =3155901a(11) =16387276a(12) =85092281a(13) =441848681a(14) =2294335686a(15) =11913527111a(16) =61861971241a(17) =321223383316