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A177296 Number of permutations of 3 copies of 1..n with all adjacent differences <= 6 in absolute value. 0
1, 1, 20, 1680, 369600, 168168000, 137225088000, 182509367040000, 156952841101056000, 96333779412718848000 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
COMMENTS
a(n) = (3n)!/6^n for n<=7.
LINKS
Table of n, a(n) for n=0..9.
CROSSREFS
Cf. A014606.
Sequence in context: A177616 A177295 A177635 * A177297 A014606 A330196
Adjacent sequences: A177293 A177294 A177295 * A177297 A177298 A177299
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 06 2010
STATUS
approved

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Last modified June 2 00:37 EDT 2024. Contains 373032 sequences. (Running on oeis4.)