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A147906
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Number of permutations of floor(i*9/5), 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, 96, 444, 2508, 13216, 74772, 490758, 3587634, 32230992, 247788878, 2035600526, 18463836692, 192838249056
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