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A147012
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 01000-11111-00010 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 7, 9, 21, 33, 561, 1063, 16239, 37023, 683049, 1813981, 73918361, 233718771, 15472778911, 58161293145, 6153586919161, 27376781533955, 5115790862761165, 27018006547805491, 8119404508895445151
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