74323976domain: NAppears in sequencesNumber of n X n 0..3 matrices with row and column i=1..n having sum <= i*3.at n=3A213957T(n,k)=Number of n X n 0..k matrices with row and column i=1..n having sum <= i*k.at n=18A213962Number of 4X4 0..n matrices with row and column 1..4 having sum <= i*n.at n=2A213964