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A145807
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1/2 the number of islands of ones fitting in an n X n array symmetric under 180 degree rotation with all ones connected only either two adjacent vertically or two adjacent horizontally.
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0
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0, 0, 1, 2, 3, 4, 6, 8, 9, 12, 14, 18, 20, 23, 27, 32
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