229265400

Appears in sequences

• a(n) = binomial(n+4,n)*binomial(n+9,n).at n=11A104672
• a(n) = binomial(n+4,n)*binomial(n+8,n).at n=12A105251
• Square array read by ascending antidiagonals: T(n,k) = (2*k)!/k! * ( (2*n*k)! * ((2*n+1)*k)! )/( (n*k)!^2 * ((n+1)*k)!^2 ).at n=25A364506
• a(n) = (5*n)!*(4*n)! / ((3*n)!^2 * (2*n)! * n!).at n=4A364507