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A156449
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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 9.
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0
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1, 2, 4, 28, 68, 788, 2096, 74764, 297215, 56568904, 378230514, 110049447136, 1117730631388, 399699792848864, 6285859127170900, 2788382742936560544
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OFFSET
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1,2
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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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