397460domain: NAppears in sequencesT(n,k)=Number of n X n 0..k arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.at n=30A229774Number of 3 X 3 0..n arrays with rows in lexicographically nondecreasing order and columns in nonincreasing order.at n=5A229775