217061167domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1)X(3+1) 0..2 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=10A250522Prime numbersat n=11969589