Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, up.
A177669
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, up.
Terms
- a(0) =1a(1) =70a(2) =33261a(3) =56506806a(4) =250834987380
External references
- oeis: A177669