Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, up, up.
A177655
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, up, up.
Terms
- a(0) =1a(1) =70a(2) =34044a(3) =59196212a(4) =269545273499
External references
- oeis: A177655