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A177609
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, up
0
1, 20, 1644, 343010, 144972862, 108488657665, 131237713050591, 240253621967060451
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A177621
A177628
A177626
*
A094035
A177614
A177622
Adjacent sequences:
A177606
A177607
A177608
*
A177610
A177611
A177612
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified September 10 12:42 EDT 2024. Contains 375790 sequences. (Running on oeis4.)