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A177294
Number of permutations of 3 copies of 1..n with all adjacent differences <= 4 in absolute value.
0
1, 1, 20, 1680, 369600, 168168000, 41494252800, 6923871998400, 983114244363720, 139528504017728552
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OFFSET
0,3
COMMENTS
a(n) = (3n)!/6^n for n<=5.
LINKS
Table of n, a(n) for n=0..9.
CROSSREFS
Cf.
A014606
.
Sequence in context:
A177617
A177629
A177630
*
A177615
A177616
A177295
Adjacent sequences:
A177291
A177292
A177293
*
A177295
A177296
A177297
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 06 2010
STATUS
approved
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Last modified April 23 20:33 EDT 2024. Contains 371916 sequences. (Running on oeis4.)