50450400domain: NAppears in sequencesMultinomial coefficients(TOP, BOTTOM), where TOP = 2^n, BOTTOM = ( C(n,0) C(n,1) C(n,2) ... C(n,n) ).at n=4A022914Denominator of 3*Sum_{i=1..n} 1/(i^2*C(2*i,i)).at n=7A112094Denominator of Sum_{k=1..n} H(k)*H(n+1-k), where H(k) is the k-th harmonic number (Sum_{j=1..k} 1/j).at n=15A130895