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A147437
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1010 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 1, 19, 11, 496, 277, 13622, 3725, 625566, 100329, 46290886, 7689337
(list; graph; refs; listen; history; internal format)
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