923742873domain: NAppears in sequencesNumber of n X n 0..2 arrays with corresponding row and column sums equal.at n=4A229866T(n,k)=Number of n X n 0..k arrays with corresponding row and column sums equal.at n=19A229870Number of 5X5 0..n arrays with corresponding row and column sums equal.at n=1A229872