149930domain: NAppears in sequencesTriangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k DUDU's starting at level 1.at n=57A135333Number of Dyck paths of semilength n having no DUDU's starting at level 1.at n=12A135339Row sums of A136375.at n=22A151711