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

Terms

a(0) =1a(1) =-2a(2) =-1a(3) =-6a(4) =-11a(5) =-34a(6) =-95a(7) =-298a(8) =-953a(9) =-3158a(10) =-10677a(11) =-36750a(12) =-128249a(13) =-452774a(14) =-1614049a(15) =-5801654a(16) =-21003739a(17) =-76516994a(18) =-280293319a(19) =-1031794394a(20) =-3814819699a(21) =-14160035234a(22) =-52747353739a(23) =-197125162514a(24) =-738866581039