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A140177
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Half the number of n X n symmetric binary matrices with adjacent rows differing in at most two positions.
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0
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1, 4, 25, 171, 1024, 5452, 27319, 133343, 650240, 3183136, 15730003, 78792479, 401274724
(list; graph; refs; listen; history; internal format)
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