168625domain: NAppears in sequencesTriangle read by rows: T(n,k) is the number of Dyck paths of semilength n and having k UDUD's starting at level 0; here U=(1,1), D=(1,-1) (0<=k<=n-1).at n=67A127153Number of Dyck paths of semilength n and having no UDUD's starting at level 0; here U=(1,1), D=(1,-1).at n=12A127154