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A147256
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Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 0001-1101-0111 pattern in any orientation.
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0
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1, 1, 1, 1, 1, 1, 17, 21, 549, 1079, 10673, 26871, 476485, 1364599, 88490477, 316329117, 38154154091, 169142706059, 28100677201207, 150981261883543, 38976852011544623
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