OFFSET
1,2
COMMENTS
FORMULA
a(n) = denominator(r(n)), n >= 1.
PROG
(PARI) a(n) = denominator(2*sum(j=1, n, (-1)^(j-1)/(j^3*binomial(2*j, j)))); \\ 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