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

Terms

a(0) =1a(1) =2a(2) =7a(3) =24a(4) =87a(5) =322a(6) =1211a(7) =4604a(8) =17645a(9) =68042a(10) =263655a(11) =1025632a(12) =4002601a(13) =15662422a(14) =61427543a(15) =241386924a(16) =950160607a(17) =3745589510a(18) =14784496003a(19) =58424093536a(20) =231112008371a(21) =915065382154