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A146659
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1100-0111-0001 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 19, 31, 777, 1691, 27963, 75639, 2292715, 7576569, 826036495, 3496134625, 778953197867, 4202373389229, 1495755903085789, 10132125701626967, 6580332072056181975, 55813749926331270805
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