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A147232
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1101-0111-0001 pattern in any orientation.
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1, 1, 1, 1, 1, 1, 19, 27, 629, 1269, 16061, 41045, 855623, 2568747, 170862305, 635460019, 86331152665, 400700298989, 79692729384535, 451816155166949, 141187687229970535
(list; graph; refs; listen; history; internal format)
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