2564096domain: NAppears in sequencesConcatenation of n^2 and n^3.at n=15A239460Number of (n+2) X (4+2) 0..3 arrays with every 3 X 3 subblock row and diagonal sum equal to 0 2 3 6 or 7 and every 3 X 3 column and antidiagonal sum not equal to 0 2 3 6 or 7.at n=20A252528