Expansion of 1/sqrt(1 - 4*x/(1 - x^3)^2).

Terms

a(0) =1a(1) =2a(2) =6a(3) =20a(4) =74a(5) =276a(6) =1044a(7) =3998a(8) =15450a(9) =60128a(10) =235332a(11) =925332a(12) =3652508a(13) =14464490a(14) =57442074a(15) =228670140a(16) =912239782a(17) =3646027752a(18) =14596600800a(19) =58523194734a(20) =234954663396a(21) =944418233612