Expansion of (1 - sqrt(1 - 4*x))^5/16.

Terms

a(0) =2a(1) =10a(2) =40a(3) =150a(4) =550a(5) =2002a(6) =7280a(7) =26520a(8) =96900a(9) =355300a(10) =1307504a(11) =4828850a(12) =17895150a(13) =66533250a(14) =248124000a(15) =927983760a(16) =3479939100a(17) =13082337900a(18) =49295766000a(19) =186156379500a(20) =704415740028