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

Terms

a(0) =1a(1) =-8a(2) =37a(3) =-144a(4) =540a(5) =-2016a(6) =7524a(7) =-28080a(8) =104796a(9) =-391104a(10) =1459620a(11) =-5447376a(12) =20329884a(13) =-75872160a(14) =283158756a(15) =-1056762864a(16) =3943892700a(17) =-14718807936a(18) =54931339044a(19) =-205006548240a(20) =765094853916