n은한줄의수를의미.1~n^2의수로마방진을만들때합은1+2+...+n^2.합의공식n^2(n^2+1)/2구하는것은한줄의합위의값을줄의수n으로나눠줘.즉,n^2(n^2+1)/2n=n(n^2+1)/2
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