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A145802
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Number of islands of ones fitting in an n X n array symmetric under horizontal reflection with all ones connected only either two adjacent vertically or two adjacent horizontally.
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0
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0, 1, 2, 4, 6, 9, 12, 15, 19, 25, 28, 33, 40, 49, 53, 60, 69, 81, 86, 95
(list; graph; refs; listen; history; internal format)
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