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A147907
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Number of permutations of floor(i*9/8), 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, 54, 232, 936, 3880, 23002, 127008, 751100, 4670780, 29781390, 193211704, 1334448490, 9604883174
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OFFSET
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1,2
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LINKS
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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