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

Terms

a(0) =1a(1) =3a(2) =15a(3) =78a(4) =411a(5) =2178a(6) =11574a(7) =61596a(8) =328083a(9) =1748346a(10) =9319650a(11) =49688004a(12) =264943902a(13) =1412826132a(14) =7534329804a(15) =40180417848a(16) =214285867011