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A180072 Number of permutations of 1..n with the sum of squared adjacent differences <= (n-1)*n*(n+1)/6 0
2, 2, 12, 62, 384, 2574, 20432, 183790, 1833102, 20075568, 240972780, 3128714960, 43794182164 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..14.

CROSSREFS

Sequence in context: A173842 A131444 A291541 * A013315 A032321 A013311

Adjacent sequences:  A180069 A180070 A180071 * A180073 A180074 A180075

KEYWORD

nonn

AUTHOR

R. H. Hardin Aug 09 2010

EXTENSIONS

a(14) from Donovan Johnson, Oct 11 2010

STATUS

approved

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Last modified February 25 08:33 EST 2021. Contains 341606 sequences. (Running on oeis4.)