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A147495
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Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 11101-10111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 1, 5, 15, 25, 49, 107, 263, 719, 2181
(list; graph; refs; listen; history; internal format)
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