Number of nX7 arrays with each row a permutation of 1..7 having at least as many downsteps as the preceding row.

A221622

Number of nX7 arrays with each row a permutation of 1..7 having at least as many downsteps as the preceding row.

Terms

    a(0) =5040a(1) =17052210a(2) =49096652080

External references