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A180111
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Number of permutations of 1..n with the Sum_{i=1..n} of (i-p(i))^2 <= (n-1)*n*(n+1)/6.
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0
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1, 1, 3, 13, 63, 360, 2612, 20628, 184784, 1814400, 20168640, 241650132, 3135712971, 43589145600, 657203494738, 10507402233956, 178516252664449, 3201186852864000, 60997137390971895, 1219540642469803416, 25602927723893352601, 562000363888803840000
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OFFSET
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1,3
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LINKS
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FORMULA
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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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