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A145816
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1/4 of the number of islands of ones fitting in an n X n array symmetric under 90 degree rotation with all ones connected only either three adjacent vertically or three adjacent horizontally.
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0
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0, 0, 0, 0, 1, 1, 2, 2, 3, 3, 4, 5, 6, 7, 9, 9, 11, 12, 14, 15, 17, 18
(list; graph; refs; listen; history; internal format)
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