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

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =15a(5) =33a(6) =75a(7) =169a(8) =375a(9) =835a(10) =1875a(11) =4203a(12) =9375a(13) =20931a(14) =46875a(15) =104919a(16) =234375a(17) =523737a(18) =1171875a(19) =2621545a(20) =5859375a(21) =13098001a(22) =29296875a(23) =65523597a(24) =146484375a(25) =327500413a(26) =732421875a(27) =1637918089