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A156469
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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 18.
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0
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1, 4, 54, 112, 5414, 21624, 2133044, 23029656, 5468265896, 163052061000, 97305384072800
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OFFSET
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2,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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