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A156459
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Number of n X n arrays of squares of integers, symmetric about both diagonal and antidiagonal, with all rows summing to 13.
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0
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2, 0, 28, 12, 1412, 3096, 337208, 4171320, 662224128, 16504055920, 4410398887272, 150978985010061, 66490911199244672
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