Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, down.

A177651

Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, down.

Terms

    a(0) =1a(1) =70a(2) =32154a(3) =51547778a(4) =212793102720

External references