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 A340936 Central terms of triangle A340934. 1

%I

%S 1,1,13,268,7611,271091,11458077,559212195,31090619367,1954991831572,

%T 138396327557838,10984169879821011,972752618602202371,

%U 95584630350151739468,10357080966486768792724,1229760196915952474094457,159050261111140771987720585,22284427776753810724534759774

%N Central terms of triangle A340934.

%o (PARI) {A340934(n, k) = my(A=1); for(i=1, n, A = sum(m=0, n, x^m/(1 - x*y*A^(2*m) +x*O(x^n))) ); polcoeff(polcoeff(A, n, x), k, y)}

%o for(n=0, 10, print1(A340934(2*n, n), ", "))

%o (PARI) {A340934(n, k) = my(A=1); for(i=1, n, A = sum(m=0, n, x^m*y^m/(1 - x*A^(2*m) +x*O(x^n))) ); polcoeff(polcoeff(A, n, x), k, y)}

%o for(n=0, 20, print1(A340934(2*n, n), ", "))

%Y Cf. A340934.

%K nonn

%O 0,3

%A _Paul D. Hanna_, Jan 28 2021

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Last modified September 20 23:04 EDT 2021. Contains 347596 sequences. (Running on oeis4.)