2450392domain: NAppears in sequencesNumber of nX3 arrays containing 3 copies of 0..n-1 with no element plus any horizontal or antidiagonal neighbor equal to n-1.at n=4A265855T(n,k) = Number of n X k arrays containing k copies of 0..n-1 with no element plus any horizontal or antidiagonal neighbor equal to n-1.at n=25A265856