%I #2 Mar 30 2012 18:59:45
%S 2,16,48,512,1280,2048,14336,262144,589824,2621440,5767168,50331648,
%T 109051904,469762048,67108864,34359738368,73014444032,103079215104,
%U 652835028992,1099511627776,3848290697216,48378511622144
%N Denominators of the column sums of the EG1 matrix coefficients
%C For the definition of the EG1 matrix coefficients see A162440.
%C We define the columns sums by cs(n) = sum(EG1[2*m-1,n], m = 1.. infinity) for n => 2.
%F a(n) = denom(cs(n)) and numer(cs(n)) = A162441(n) with cs(n) = (2^(2-2*n)/(n-1))*((2*n-1)!/((n-1)!^2)).
%F a(n) = denom((1/(n-1))*(2*n-1)*binomial(2*n-2,n-1)/4^(n-1))
%Y Equals A052469(n-1)/2 for n=>2.
%Y cs(n) = (1/(n-1))*A001803(n-1)/A046161(n-1) for n=>2.
%Y Cf. A162440 and A162441.
%K easy,frac,nonn
%O 2,1
%A _Johannes W. Meijer_, Jul 06 2009