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A147393
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1000-1000-1111-0001-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 1, 13, 19, 229, 391, 2411, 4925
(list; graph; refs; listen; history; internal format)
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