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A147438
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Number of n X n binary arrays symmetric under horizontal and vertical 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, 1, 1, 1, 1, 18, 9, 122, 25, 908, 89, 6686, 611
(list; graph; refs; listen; history; internal format)
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