993219domain: NAppears in sequencesNumber of n X n 0..1 arrays with every one equal to some NW, E or S neighbor.at n=4A202899Number of nX5 0..1 arrays with every one equal to some NW, E or S neighbor.at n=4A202903T(n,k) = Number of n X k 0..1 arrays with every one equal to some NW, E or S neighbor.at n=40A202906