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A156434
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Number of n X n arrays of squares of integers, symmetric about main diagonal, with all rows summing to 4.
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0
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1, 2, 4, 11, 57, 1082, 42354, 2278938, 154294582, 12767337844, 1267231350044, 148617033979348, 20331541618406216
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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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