Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive step pattern up, down, up, down.
A264077
Number of permutations of [n] with exactly two (possibly overlapping) occurrences of the consecutive step pattern up, down, up, down.
Terms
- a(0) =272a(1) =4352a(2) =42880a(3) =530432a(4) =7662336a(5) =101713920a(6) =1402932224a(7) =21604831232a(8) =343423787008
External references
- oeis: A264077