17835379domain: NPropertiesPrimalityPrimeyesAppears in sequencesNumber of (n+1)X(1+1) 0..3 arrays with nondecreasing x(i,j)+x(i,j-1) in the i direction and nondecreasing absolute value of x(i,j)-x(i-1,j) in the j direction.at n=8A250669Prime numbersat n=1141439