OFFSET
0,2
COMMENTS
Main diagonal of square table A299427.
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..310
FORMULA
a(n) ~ 2^(n - 3/2) * exp(n + 5/4) * n^(n - 1/2) / sqrt(Pi). - Vaclav Kotesovec, Feb 19 2018
PROG
(PARI) {a(n) = binomial((n+1)*(2*n+1), n) * (n+1)/(2*n+1)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Feb 19 2018
EXTENSIONS
a(15) corrected by Seiichi Manyama, Feb 10 2019
STATUS
approved