OFFSET
1,2
COMMENTS
The corresponding denominators are given in A120995.
The normalized sequence of rationals r(n):=(3/4)*W(n), with r(1)=1, converges to 3*Pi/8 = 1.178097245...
LINKS
FORMULA
a(n) = numerator((3/4)*W(n)), n>=1, with the rationals W(n) given above. An equivalent form is W(n) = (((4^n)/binomial(2*n,n))^2)/(2*n+1).
EXAMPLE
Rationals r(n)=((3/4)*W(n)): [1, 16/15, 192/175, 4096/3675,
16384/14553, 262144/231231, 1048576/920205, 268435456/234652275,...]
CROSSREFS
KEYWORD
nonn,easy,frac
AUTHOR
Wolfdieter Lang, Aug 01 2006
STATUS
approved