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

A177644

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

Terms

    a(0) =1a(1) =70a(2) =29874a(3) =43724128a(4) =163394718481

External references