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A177614
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, down, up, up
0
1, 20, 1657, 352228, 152954196, 118201230707, 148140760913064, 281601795477345111
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A177626
A177609
A094035
*
A177622
A177627
A177620
Adjacent sequences:
A177611
A177612
A177613
*
A177615
A177616
A177617
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 24 19:52 EDT 2024. Contains 371963 sequences. (Running on oeis4.)