For the number n divisible by 4, we can construct magic square as follows:
1. From left to right, from the first line to the nth line, in the order of 1, 2 And n ^ 2 fills this matrix.
2. Divide the above matrix into m ^ 2 small 4×4 matrices. For the number a on the two diagonals of each 4×4 small matrix, replace a with the complement of a, the square of N + 1-A.
That is: A & lt; – n ^ 2 + A-1
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