15106048domain: NAppears in sequencesNumber of n X n 0..3 arrays with corresponding row and column sums equal.at n=3A229867T(n,k)=Number of n X n 0..k arrays with corresponding row and column sums equal.at n=18A229870Number of 4X4 0..n arrays with corresponding row and column sums equal.at n=2A229871