OFFSET
1,2
COMMENTS
The first 14 terms are identical to A052468.
LINKS
F. J. Dyson, N. E. Frankel, M. L. Glasser, Lehmer's Interesting Series, arXiv:1009.4274 [math-ph], 2010-2011.
F. J. Dyson, N. E. Frankel, and M. L. Glasser, Lehmer's interesting series, Amer. Math. Monthly, 120 (2013), 116-130.
D. H. Lehmer, Interesting series involving the central binomial coefficient, Amer. Math. Monthly, 92(7) (1985), 449-457.
FORMULA
a(n) = denominator(n^2*2^n/C(2*n,n)).
MATHEMATICA
Table[2^n*n^2/Binomial[2*n, n] // Denominator, {n, 1, 40}]
PROG
(PARI) vector(40, n, denominator(n^2*2^n/binomial(2*n, n))) \\ Michel Marcus, Jul 07 2015
CROSSREFS
KEYWORD
nonn,frac,easy
AUTHOR
Jean-François Alcover, Jul 07 2015
STATUS
approved