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A177621
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, down, up
0
1, 20, 1635, 339708, 143060850, 106681715484, 128573202886349, 234439539245241093
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A331563
A250018
A177604
*
A177628
A177626
A177609
Adjacent sequences:
A177618
A177619
A177620
*
A177622
A177623
A177624
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 18 22:18 EDT 2024. Contains 371782 sequences. (Running on oeis4.)