372154127domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1) X (7+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=12A250754Prime numbersat n=19927431