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A048068
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Number of nonempty subsets of {1,2,...,n} in which exactly 4/5 of the elements are <= (n-4)/2.
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0
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0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 8, 9, 45, 50, 150, 165, 385, 420, 906, 988, 2340, 2583, 7035, 7875, 22275, 25080, 67880, 76415, 196027, 220389, 551733, 620711
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