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

Terms

a(0) =1a(1) =2a(2) =7a(3) =25a(4) =93a(5) =353a(6) =1358a(7) =5273a(8) =20614a(9) =81003a(10) =319584a(11) =1264924a(12) =5019743a(13) =19963699a(14) =79541181a(15) =317406302a(16) =1268283199a(17) =5073605801a(18) =20316709251a(19) =81427911966a(20) =326612013623