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

A177663

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

Terms

    a(0) =1a(1) =70a(2) =34052a(3) =59177576a(4) =268686190790

External references