724082352domain: NAppears in sequencesNumber of nX6 0..5 arrays with no column j greater than column j-1 in all rows.at n=1A212928T(n,k) = number of n X k 0..k-1 arrays with no column j greater than column j-1 in all rows.at n=22A212930Number of 2Xn 0..n-1 arrays with no column j greater than column j-1 in all rows.at n=5A212931