Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up.
A177652
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up.
Terms
- a(0) =1a(1) =65a(2) =27707a(3) =41243158a(4) =159108376040
External references
- oeis: A177652