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A156440
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Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 6.
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0
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4, 42, 552, 13751, 425674, 18458342, 1164072896, 139921844820, 38221283215416, 19223028387830564, 13952451706754445456
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OFFSET
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3,1
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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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