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A180070
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Number of permutations of {1..n} with the sum of squared adjacent differences <= n*(n+1)/2.
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2
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1, 1, 2, 6, 12, 44, 116, 374, 1428, 5960, 26016, 120570, 590598, 3065372, 16566508, 92827128, 542485764, 3298228302, 20696614200, 133722820270, 892046755174, 6136788856858, 43308637312440, 313079705562778, 2322726645160856
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OFFSET
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0,3
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LINKS
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CROSSREFS
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KEYWORD
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nonn,hard,changed
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AUTHOR
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EXTENSIONS
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STATUS
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approved
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