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A140336
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Half the number of n X n binary matrices differing in at most one position between adjacent rows and at most one position between adjacent columns.
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0
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1, 5, 16, 47, 138, 419, 1358, 4615, 16562, 61879, 240506, 967043, 4011246, 17127819, 75094742
(list; graph; refs; listen; history; internal format)
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