Number of n X 5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row.

A221620

Number of n X 5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row.

Terms

    a(0) =120a(1) =10055a(2) =738150a(3) =51149685a(4) =3451956516a(5) =230141263315

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