OFFSET
1,2
MATHEMATICA
seq[n_] := Module[{A = O[x]^n}, G[2n, x+A, {1, 1}]/G[2n, x+A, {}] // CoefficientList[#, x]&]; (* Jean-François Alcover, Dec 02 2020, after Andrew Howroyd's code for G in A339065 *)
PROG
(PARI) \\ See A339065 for G.
seq(n)={my(A=O(x*x^n)); Vec(G(2*n, x+A, [1, 1])/G(2*n, x+A, []))}
CROSSREFS
KEYWORD
nonn
AUTHOR
Andrew Howroyd, Nov 20 2020
STATUS
approved