Number of permutations of [n] avoiding simultaneously consecutive step patterns UUD, UDU, DUU (U=up, D=down).

A231385

Number of permutations of [n] avoiding simultaneously consecutive step patterns UUD, UDU, DUU (U=up, D=down).

Terms

    a(0) =1a(1) =1a(2) =2a(3) =6a(4) =13a(5) =39a(6) =158a(7) =674a(8) =3304a(9) =19511a(10) =122706a(11) =834131a(12) =6416525a(13) =52909708a(14) =462097526a(15) =4395014406a(16) =44626369587a(17) =476351029850

External references