OFFSET
0,2
LINKS
Seiichi Manyama, Table of n, a(n) for n = 0..606
FORMULA
4*n^2*(2*n-1)*(2*n+1)*a(n) -9*(3*n-1)^2*(3*n-2)^2*a(n-1)=0. - R. J. Mathar, Dec 02 2016
MATHEMATICA
Table[(Binomial[3n-1, n]Binomial[3n, n])/(2n+1), {n, 0, 50}] (* Harvey P. Dale, Mar 26 2023 *)
PROG
(PARI) {a(n) = binomial(3*n-1, n) * binomial(3*n, n) / (2*n+1)}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 29 2016
STATUS
approved