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A177617
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, down, down, up.
0
1, 1, 20, 1680, 369600, 167510862, 135702841152, 178756061502340, 357729925926146006
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..8.
CROSSREFS
Cf.
A014606
.
Sequence in context:
A266738
A177605
A177606
*
A177629
A177630
A177294
Adjacent sequences:
A177614
A177615
A177616
*
A177618
A177619
A177620
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
STATUS
approved
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Last modified September 2 05:36 EDT 2024. Contains 375604 sequences. (Running on oeis4.)