927081domain: NAppears in sequencesNumber of noncrossing rooted trees with n nodes on a circle that do not have leaves at level 1.at n=10A023053Triangle read by rows: T(n,k) is the number of noncrossing trees with n edges and k leaves at level 1.at n=55A101371Pseudoprimes to base 10 that are not squarefree.at n=26A306449