Square array read by ascending antidiagonals, n>=0, k>=0. Row n is the expansion of (1-n*x-sqrt(n^2*x^2-2*n*x-4*x+1))/(2*x).

A247507

Square array read by ascending antidiagonals, n>=0, k>=0. Row n is the expansion of (1-n*x-sqrt(n^2*x^2-2*n*x-4*x+1))/(2*x).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =2a(6) =1a(7) =3a(8) =6a(9) =5a(10) =1a(11) =4a(12) =12a(13) =22a(14) =14a(15) =1a(16) =5a(17) =20a(18) =57a(19) =90a(20) =42a(21) =1a(22) =6a(23) =30a(24) =116a(25) =300a(26) =394a(27) =132a(28) =1a(29) =7

External references