2125824domain: NAppears in sequencesNumbers that are not the sum of two squares and two fourth powers.at n=30A214891Number of (n+2) X (7+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7.at n=12A252113