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

A177673

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

Terms

    a(0) =1a(1) =70a(2) =34290a(3) =60635566a(4) =281746189372

External references