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A147933
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Number of permutations of floor(i*9/7), 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, 16, 74, 304, 1424, 7946, 44418, 271160, 1760020, 13590836, 107901418, 882093328, 8656696052, 83441646558
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