Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up.

A177598

Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up.

Terms

    a(0) =1a(1) =15a(2) =767a(3) =93621a(4) =22431655a(5) =9362799454

External references