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A147903
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Number of permutations of floor(i*7/4), 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, 24, 96, 456, 2134, 11650, 74546, 530962, 3437002, 24793292, 214741200, 2028628716, 17460401888, 162168439452
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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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