Expansion of 1/sqrt(1-4*x-64*x^2).

Terms

a(0) =1a(1) =2a(2) =38a(3) =212a(4) =2566a(5) =20092a(6) =210524a(7) =1884136a(8) =18854854a(9) =178415852a(10) =1764019828a(11) =17115907096a(12) =169100140444