191440domain: NAppears in sequencesNumber of 2 X 2 non-singular integer matrices with entries from {0,...,n}.at n=20A062801Row sums of triangle in A074829.at n=16A074878Number of rooted trees with n nodes, most of which are leaves.at n=16A358581Number of rooted trees with n nodes, at least half of which are leaves.at n=16A358583