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A146776
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0010-1010-1111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 27, 551, 1025, 9065, 24039, 430341, 1208611, 88984447, 322624067, 42836270201, 190686627801, 27661973527585, 149211196626477, 36642661396277021
(list; graph; refs; listen; history; internal format)
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