OFFSET
0,2
PROG
(PARI) {a(n) = (4*n+1) * ( binomial(3*n, n)/(2*n+1) )^2}
for(n=0, 20, print1(a(n), ", "))
CROSSREFS
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Nov 29 2016
STATUS
approved