Number of ascent sequences of length n with exactly four flat steps.

A242157

Number of ascent sequences of length n with exactly four flat steps.

Terms

    a(0) =1a(1) =5a(2) =30a(3) =175a(4) =1120a(5) =7686a(6) =56910a(7) =452760a(8) =3858525a(9) =35101495a(10) =339725386a(11) =3487023540a(12) =37846867240a(13) =433186049100

External references