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A180073
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Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6.
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1
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0, 2, 12, 56, 344, 2486, 19936, 179772, 1800566, 19867748, 238718608, 3105919304, 43474755484, 652732780048, 10446585803476, 177631436657888
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OFFSET
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2,2
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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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EXTENSIONS
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STATUS
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approved
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