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A054578
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Number of subsequences of {1..n} such that all differences of pairs of terms are distinct (i.e. number of Golomb rulers on {1..n}).
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1
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1, 3, 6, 12, 21, 35, 56, 90, 139, 215, 316, 462, 667, 961, 1358, 1918, 2665, 3693, 5034, 6844, 9187, 12365
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