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A147941
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Number of permutations of floor(i*9/4), i=0..n-1, with all sums of 2 through 4 adjacent terms respectively unique.
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0
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1, 2, 6, 16, 96, 376, 1924, 10496, 84546, 522100, 3532332, 28645680, 292372132, 2430262092, 21376627926, 227599952694
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