111920domain: NAppears in sequencesNumber of n X n (0,1,2)-matrices with every row sum 3 and column sum 3.at n=4A134646Number of n X n 0..2 arrays with row sums 7 and column sums 7.at n=4A172628Number of 5*n X 5 0..2 arrays with row sums 3 and column sums 3*n.at n=0A172699