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A139016
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Number of n X n symmetric binary matrices containing no more than six 1s in any 3 X 3 sub-block.
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0
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1, 2, 8, 54, 750, 20314, 1052864, 105578342, 20460453442, 7658537650814, 5538947499948096, 7739159053160945260, 20889681750864696919512, 108933637117589912345519132
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OFFSET
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0,2
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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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