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

Terms

a(0) =1a(1) =1a(2) =6a(3) =18a(4) =70a(5) =246a(6) =924a(7) =3412a(8) =12870a(9) =48550a(10) =184756a(11) =705180a(12) =2704156a(13) =10399676a(14) =40116600a(15) =155114088a(16) =601080390a(17) =2333593350a(18) =9075135300a(19) =35345215180a(20) =137846528820a(21) =538257689684