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A147050
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Number of n X n binary arrays symmetric under 180 degree rotation with all ones connected only in a 0100-1100-0111-0010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 5, 17, 45, 201, 861, 4033, 28285, 222873, 2292605, 26123281, 391420701, 6423928729
(list; graph; refs; listen; history; internal format)
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