Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up.
A177667
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up.
Terms
- a(0) =1a(1) =70a(2) =33395a(3) =56878758a(4) =252566336705
External references
- oeis: A177667