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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
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OFFSET
0,3
COMMENTS
a(n) = (3n)!/6^n for n<=8.
LINKS
Table of n, a(n) for n=0..9.
CROSSREFS
Cf.
A014606
.
Sequence in context:
A177295
A177635
A177296
*
A014606
A330196
A172556
Adjacent sequences:
A177294
A177295
A177296
*
A177298
A177299
A177300
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.)