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A147928
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Number of permutations of floor(i*7/3), i=0..n-1, with all sums of two and three adjacent terms respectively unique.
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0
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1, 2, 6, 24, 74, 368, 2214, 10892, 70136, 578748, 3920958, 33396960, 341266768, 2847640070, 30294332328, 372805397466
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