169196domain: NAppears in sequencesn^2 concatenated with (n+1)^2.at n=13A246973Number of (n+2)X(2+2) 0..3 arrays with every 3X3 subblock row and column sum not 2 4 5 or 7 and every diagonal and antidiagonal sum 2 4 5 or 7.at n=7A251870