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A177297 Number of permutations of 3 copies of 1..n with all adjacent differences <= 7 in absolute value. 0
1, 1, 20, 1680, 369600, 168168000, 137225088000, 182509367040000, 369398958888960000, 510778379991559680000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
a(n) = (3n)!/6^n for n<=8.
LINKS
CROSSREFS
Cf. A014606.
Sequence in context: A177295 A177635 A177296 * A014606 A330196 A172556
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved

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Last modified March 28 13:25 EDT 2024. Contains 371254 sequences. (Running on oeis4.)