Expansion of g.f. x/(1 + 4*x - 8*x^2).

Terms

a(0) =0a(1) =1a(2) =-4a(3) =24a(4) =-128a(5) =704a(6) =-3840a(7) =20992a(8) =-114688a(9) =626688a(10) =-3424256a(11) =18710528a(12) =-102236160a(13) =558628864a(14) =-3052404736a(15) =16678649856a(16) =-91133837312a(17) =497964548096