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

Terms

a(0) =1a(1) =2a(2) =6a(3) =18a(4) =57a(5) =186a(6) =622a(7) =2120a(8) =7338a(9) =25724a(10) =91144a(11) =325878a(12) =1174281a(13) =4260282a(14) =15548694a(15) =57048048a(16) =210295326a(17) =778483932a(18) =2892818244a(19) =10786724388a(20) =40347919626a(21) =151355847012a(22) =569274150156