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A299429 a(n) = binomial((n+1)*(2*n+1), n) / ((n+1)*(2*n+1)). 3
1, 1, 7, 117, 3311, 135408, 7324878, 495729741, 40411916335, 3861208027677, 423601805745460, 52513639293534510, 7263163165618323432, 1109176062938132317300, 185415009041446934481180, 33681956588219177374026429, 6607825171826115567872400495, 1392510451119380284814728497375 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

COMMENTS

a(n) = A299428(n) / (n+1)^2.

LINKS

Paul D. Hanna, Table of n, a(n) for n = 0..200

PROG

(PARI) {a(n) = binomial((n+1)*(2*n+1), n)/((n+1)*(2*n+1)) }

for(n=0, 20, print1(a(n), ", "))

CROSSREFS

Cf. A299427, A299428.

Sequence in context: A050285 A096760 A178791 * A297308 A077394 A009696

Adjacent sequences:  A299426 A299427 A299428 * A299430 A299431 A299432

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Feb 19 2018

STATUS

approved

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Last modified November 14 02:19 EST 2019. Contains 329108 sequences. (Running on oeis4.)