495518534domain: NAppears in sequencesNumber of (n+2)X(1+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 3.at n=6A251951T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with no row, column, diagonal or antidiagonal in any 3X3 subblock summing to 3.at n=21A251955