OFFSET
1,3
COMMENTS
FORMULA
a(n) = denominator(r(n)), n>=1.
PROG
(PARI) a(n) = denominator(6*(sum(k=1, n, 1/binomial(2*k, k)) - 1/3)); \\ Michel Marcus, Nov 09 2019
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Wolfdieter Lang, Jul 13 2007
EXTENSIONS
More terms from Michel Marcus, Nov 09 2019
STATUS
approved