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

A246246

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

Terms

    a(0) =3a(1) =30a(2) =270a(3) =2322a(4) =20772a(5) =195372a(6) =1958337a(7) =20933154a(8) =238789782a(9) =2900868876a(10) =37451986200a(11) =512534035080

External references