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A299429
a(n) = binomial((n+1)*(2*n+1), n) / ((n+1)*(2*n+1)).
4
1, 1, 7, 117, 3311, 135408, 7324878, 495729741, 40411916335, 3861208027677, 423601805745460, 52513639293534510, 7263163165618323432, 1109176062938132317300, 185415009041446934481180, 33681956588219177374026429, 6607825171826115567872400495, 1392510451119380284814728497375
OFFSET
0,3
COMMENTS
a(n) = A299428(n) / (n+1)^2.
LINKS
PROG
(PARI) {a(n) = binomial((n+1)*(2*n+1), n)/((n+1)*(2*n+1)) }
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
Sequence in context: A050285 A096760 A178791 * A297308 A077394 A009696
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Feb 19 2018
STATUS
approved