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A156448
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Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 9.
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0
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1, 2, 8, 68, 868, 19436, 638012, 57507580, 22620401127, 17074878770018, 18408433074826454
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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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