OFFSET
1,2
COMMENTS
The corresponding numerators are A120994.
The rationals W(n):= (((4^n)/binomial(2*n,n))^2)/(2*n+1) converge to Pi/2 = 1.570796327...
FORMULA
a(n) = denominators((3/4)*W(n)), n>=1.
CROSSREFS
KEYWORD
nonn,easy,frac
AUTHOR
Wolfdieter Lang, Aug 01 2006
STATUS
approved