Number of nX4 arrays containing 4 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order.

A180838

Number of nX4 arrays containing 4 indistinguishable copies of 1..n with rows and columns in lexicographically strictly increasing order.

Terms

    a(0) =1a(1) =1a(2) =472a(3) =300888a(4) =333191079a(5) =637698093267

External references