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A140963
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Half the number of n X n symmetric binary matrices with each 1 adjacent to an even number of other 1's.
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1
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1, 3, 14, 99, 1082, 17997, 460186, 17967189, 1075650798, 98475760770, 13808877966564, 2962829880373443, 973285891955586078, 489313659027753121941, 376571597820325396861232
(list; graph; refs; listen; history; internal format)
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