A299429 a(n) = binomial((n+1)*(2*n+1), n) / ((n+1)*(2*n+1)).

1, 1, 7, 117, 3311, 135408, 7324878, 495729741, 40411916335, 3861208027677, 423601805745460, 52513639293534510, 7263163165618323432, 1109176062938132317300, 185415009041446934481180, 33681956588219177374026429, 6607825171826115567872400495, 1392510451119380284814728497375

Offset: 0

Author

Paul D. Hanna, Feb 19 2018

Keywords

• nonn

Comments

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

Links

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

Crossrefs

Cf. A299427, A299428.

Programs

PARI

{a(n) = binomial((n+1)*(2*n+1), n)/((n+1)*(2*n+1)) }
for(n=0,20,print1(a(n),", "))