Number of permutations of [n] with exactly two occurrences of the consecutive step pattern up, down, down.

A246247

Number of permutations of [n] with exactly two occurrences of the consecutive step pattern up, down, down.

Terms

    a(0) =99a(1) =2214a(2) =38394a(3) =591543a(4) =8826246a(5) =131367258a(6) =1989555210a(7) =30951663300a(8) =497599843140

External references