19122246

Appears in sequences

• Expansion of 1/(1-4*x)^(9/2).at n=8A020920
• a(n) = (6n)!n!/((3n)!(2n)!^2).at n=4A061162
• a(n) = ((3*n)!/n!^2)*(Gamma(1+n/2)/Gamma(1+3n/2)).at n=8A091527
• Square array read by ascending antidiagonals: T(n,k) = [x^(2*k)] ( (1 + x)^(n+2)/(1 - x)^(n-2) )^k for n, k >= 0.at n=40A364518