Number of skew Dyck paths of semilength n that have no primitive Dyck factors.

A129155

Number of skew Dyck paths of semilength n that have no primitive Dyck factors.

Terms

    a(0) =1a(1) =0a(2) =1a(3) =4a(4) =15a(5) =59a(6) =241a(7) =1011a(8) =4326a(9) =18797a(10) =82685a(11) =367410a(12) =1646494a(13) =7432270a(14) =33761322a(15) =154213566a(16) =707882503a(17) =3263713148a(18) =15107319268a(19) =70182332975a(20) =327111450097

External references