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A139008
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Number of x X n symmetric binary matrices containing no more than three 1s in any 2 X 2 sub-block.
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1
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1, 2, 7, 49, 648, 16475, 801489, 74700792, 13333992705, 4558747755857, 2985167883475040, 3743977846899435969, 8993695705522239110137, 41379357418095833391759776, 364644672948881035681654421967
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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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