Number of permutations of [n] with exactly four occurrences of the consecutive step pattern up, down, down.
A246249
Number of permutations of [n] with exactly four occurrences of the consecutive step pattern up, down, down.
Terms
- a(0) =3052323a(1) =186723630a(2) =7683652710a(3) =260901740745
External references
- oeis: A246249