Number of nX6 arrays with each row a permutation of 1..6 having at least as many downsteps as the preceding row.

A221621

Number of nX6 arrays with each row a permutation of 1..6 having at least as many downsteps as the preceding row.

Terms

    a(0) =720a(1) =353654a(2) =148700748a(3) =57614883627

External references