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A147934
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Number of permutations of floor(i*4/3), 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, 24, 74, 312, 1620, 7876, 41114, 262142, 1640026, 10906856, 84761678, 627751836, 5070873342, 46757075664
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