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A048039
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Number of nonempty subsets of {1,2,...,n} in which exactly 1/3 of the elements are <= (n+1)/3.
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0
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0, 0, 1, 3, 6, 13, 25, 45, 91, 175, 322, 645, 1245, 2325, 4651, 9031, 17061, 34123, 66547, 126763, 253527, 496063, 950818, 1901637, 3730293, 7184421, 14368843, 28243063, 54604081, 109208163, 215008363, 416990563, 833981127
(list; graph; refs; listen; history; internal format)
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