A340936 Central terms of triangle A340934.

1, 1, 13, 268, 7611, 271091, 11458077, 559212195, 31090619367, 1954991831572, 138396327557838, 10984169879821011, 972752618602202371, 95584630350151739468, 10357080966486768792724, 1229760196915952474094457, 159050261111140771987720585, 22284427776753810724534759774

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 A364243

Adjacent sequences: A340933 A340934 A340935 * A340937 A340938 A340939

Keyword

nonn

Author

Paul D. Hanna, Jan 28 2021

Status

approved