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A147936
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Number of permutations of floor(i*6/5), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
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1, 2, 6, 16, 54, 260, 1236, 6360, 31636, 166080, 1095490, 6861468, 47125320, 327177196, 2371069132, 20747895710
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