Number of Dyck paths of semilength n such that each positive level up to the highest nonempty level has at least one peak.

A287901

Number of Dyck paths of semilength n such that each positive level up to the highest nonempty level has at least one peak.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =17a(6) =49a(7) =147a(8) =459a(9) =1476a(10) =4856a(11) =16282a(12) =55466a(13) =191474a(14) =668510a(15) =2356944a(16) =8380944a(17) =30025814a(18) =108289093a(19) =392871484a(20) =1432934360a(21) =5251507624a(22) =19329771911a(23) =71430479820a(24) =264914270527a(25) =985737417231

External references