936670590450domain: NAppears in sequencesNumber of 7 X 7 stochastic matrices of integers.at n=4A008552Number of n X n of nonnegative integers with all row and column sums equal to 4.at n=7A172806Number of 7*n X 7 0..4 arrays with row sums 4 and column sums 4*n.at n=0A172853