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

Terms

a(0) =1a(1) =2a(2) =14a(3) =88a(4) =566a(5) =3722a(6) =24856a(7) =167868a(8) =1143462a(9) =7841434a(10) =54065574a(11) =374437404a(12) =2602879712a(13) =18150990238a(14) =126918338116a(15) =889551010728