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A147937
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Number of permutations of floor(i*7/3), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
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1, 2, 6, 24, 74, 368, 2214, 10892, 69096, 539954, 3553936, 28970266, 277928108, 2211165332, 22140514554, 252424615916
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