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

A177662

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

Terms

    a(0) =1a(1) =70a(2) =33156a(3) =55668310a(4) =242732516630

External references