343447domain: NAppears in sequencesNonnegative values x of solutions (x, y) to the Diophantine equation x^2+(x+449)^2 = y^2.at n=13A130004Number of (n+2)X(3+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 2 3 4 6 or 7 and every 3X3 column and antidiagonal sum not equal to 2 3 4 6 or 7.at n=8A252402