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A180073
Number of permutations of 1..n with the sum of squared adjacent differences < (n-1)*n*(n+1)/6.
1
0, 2, 12, 56, 344, 2486, 19936, 179772, 1800566, 19867748, 238718608, 3105919304, 43474755484, 652732780048, 10446585803476, 177631436657888
OFFSET
2,2
CROSSREFS
Sequence in context: A105487 A098453 A256150 * A363402 A067125 A177782
KEYWORD
nonn
AUTHOR
R. H. Hardin, Aug 09 2010
EXTENSIONS
a(14) from Donovan Johnson, Oct 11 2010
a(15)-a(17) from Martin Ehrenstein, Nov 16 2023
STATUS
approved