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A147476
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-1111-1100 pattern in any orientation.
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0
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1, 1, 1, 1, 5, 1, 23, 11, 466, 277, 14218, 3983, 707294, 112981, 56470385, 8891967
(list; graph; refs; listen; history; internal format)
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