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

A177650

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

Terms

    a(0) =1a(1) =70a(2) =33607a(3) =56904056a(4) =249804639258

External references