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

Terms

a(0) =1a(1) =2a(2) =6a(3) =24a(4) =94a(5) =378a(6) =1544a(7) =6380a(8) =26598a(9) =111658a(10) =471358a(11) =1998924a(12) =8509368a(13) =36341278a(14) =155634228a(15) =668116136a(16) =2874157222a(17) =12387209982a(18) =53475080494a(19) =231189987224