20991600domain: NAppears in sequencesTriangle of coefficients of certain Sheffer-polynomials.at n=30A048870T(n,k) = Number of n X k arrays containing k copies of 0..n-1 with row sums equal.at n=38A268367Number of 3 X n arrays containing n copies of 0..3-1 with row sums equal.at n=6A268369