3323712domain: NAppears in sequencesNumber of n X n 0..6 matrices with row and column i=1..n having sum <= i*6.at n=2A213960T(n,k)=Number of n X n 0..k matrices with row and column i=1..n having sum <= i*k.at n=30A213962Number of 3X3 0..n matrices with row and column 1..3 having sum <= i*n.at n=5A213963