33556496domain: NAppears in sequencesNumber of (n+1) X (3+1) 0..1 arrays with nondecreasing x(i,j)-x(i,j-1) in the i direction and nondecreasing x(i,j)-x(i-1,j) in the j direction.at n=19A250606Number of ways to choose a constant partition of each part of a constant partition of n.at n=50A279789