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

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =49a(5) =175a(6) =657a(7) =2559a(8) =10241a(9) =41855a(10) =173953a(11) =732927a(12) =3123457a(13) =13439743a(14) =58307841a(15) =254779391a(16) =1120247809a(17) =4952864767a(18) =22005184513a(19) =98196398079a(20) =439923990529