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A147885
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Number of permutations of floor(i*5/2), i=0..n-1, with all sums of two adjacent terms unique.
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0
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1, 2, 6, 16, 74, 368, 2016, 12168, 85462, 646544, 5510236, 49722456, 500178548, 5288883744, 60900708056, 733070993472
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