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A340936 Central terms of triangle A340934. 1
1, 1, 13, 268, 7611, 271091, 11458077, 559212195, 31090619367, 1954991831572, 138396327557838, 10984169879821011, 972752618602202371, 95584630350151739468, 10357080966486768792724, 1229760196915952474094457, 159050261111140771987720585, 22284427776753810724534759774 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..17.

PROG

(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)}

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

(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)}

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

CROSSREFS

Cf. A340934.

Sequence in context: A142811 A034833 A101004 * A142931 A142262 A163155

Adjacent sequences:  A340933 A340934 A340935 * A340937 A340938 A340939

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jan 28 2021

STATUS

approved

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Last modified July 29 22:26 EDT 2021. Contains 346346 sequences. (Running on oeis4.)