Square array of expansions of 1/sqrt(1-4x-4*k*x^2), read by antidiagonals.

Terms

a(0) =1a(1) =2a(2) =1a(3) =6a(4) =2a(5) =1a(6) =20a(7) =8a(8) =2a(9) =1a(10) =70a(11) =32a(12) =10a(13) =2a(14) =1a(15) =252a(16) =136a(17) =44a(18) =12a(19) =2a(20) =1a(21) =924a(22) =592a(23) =214a(24) =56a(25) =14a(26) =2a(27) =1a(28) =3432a(29) =2624