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A013914
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Number of distinct nonzero absolute values of sum_{j=1}^n \sigma_j \exp( i \pi j / n ) where \sigma_j = +- 1.
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0
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1, 1, 1, 2, 3, 4, 8, 12, 16, 33, 62, 67, 186, 316, 280, 1040, 1963, 1702, 6830, 10751, 8679, 45838, 88255, 56292, 264838, 624778
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