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A177623
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up
0
1, 20, 1680, 367262, 165022063, 132375585604, 172527174986381, 341425620652837589
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A177624
A177613
A177619
*
A177633
A177634
A177293
Adjacent sequences:
A177620
A177621
A177622
*
A177624
A177625
A177626
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 27 21:23 EDT 2024. Contains 372020 sequences. (Running on oeis4.)