Number of ascent sequences of length n with exactly two descents.

A241872

Number of ascent sequences of length n with exactly two descents.

Terms

    a(0) =4a(1) =53a(2) =429a(3) =2748a(4) =15342a(5) =78339a(6) =376159a(7) =1728458a(8) =7689744a(9) =33393393a(10) =142376385a(11) =598555320a(12) =2489143090a(13) =10264270175a(14) =42048021027a(15) =171366151974a(16) =695585112660

External references