8459809773domain: NAppears in sequencesNumber of n X n 0..2 matrices with all row and column sums equal.at n=6A067210T(n,k) is the number of n X n 0..k arrays with row and column sums equal.at n=42A202784Number of n X 6 0..2 arrays with row sums equal and column sums equal.at n=5A203562