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

A242161

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

Terms

    a(0) =1a(1) =9a(2) =90a(3) =825a(4) =7920a(5) =78507a(6) =813813a(7) =8828820a(8) =100321650a(9) =1193450830a(10) =14850852588a(11) =193081474872

External references