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A180073 Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6 0
0, 2, 12, 56, 344, 2486, 19936, 179772, 1800566, 19867748, 238718608, 3105919304, 43474755484 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

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

CROSSREFS

Sequence in context: A105487 A098453 A256150 * A067125 A177782 A005038

Adjacent sequences:  A180070 A180071 A180072 * A180074 A180075 A180076

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.)