Expansion of (1-sqrt(1-8*x-8*x^2))/(4*x).

Terms

a(0) =1a(1) =3a(2) =12a(3) =66a(4) =408a(5) =2712a(6) =18912a(7) =136488a(8) =1010784a(9) =7637664a(10) =58650240a(11) =456377664a(12) =3590674176a(13) =28516332288a(14) =228297907200