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A139014
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Number of n X n symmetric binary matrices containing no more than four 1s in any 3 X 3 sub-block.
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0
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1, 2, 8, 32, 314, 5328, 141832, 6811777, 564010260, 79061881217, 19181583464422, 8010187646338006, 5733911909201520816, 7059956003044566892312
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