Triangle T(M, N): Number of M X N matrices where 1<N<=M, all elements are distinct, all elements are at least 0 and at most M*N-1, and every 2 X 2 block of elements has the same sum.

A263542

Triangle T(M, N): Number of M X N matrices where 1<N<=M, all elements are distinct, all elements are at least 0 and at most M*N-1, and every 2 X 2 block of elements has the same sum.