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A177595
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down.
0
1, 10, 238, 10588, 779092, 87126856, 13960372312, 3064747884400, 890409817619536, 332982388081862176
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A268080
A096331
A159497
*
A013922
A215835
A006423
Adjacent sequences:
A177592
A177593
A177594
*
A177596
A177597
A177598
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
EXTENSIONS
a(10) from
Alois P. Heinz
, Oct 22 2013
STATUS
approved
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Last modified May 17 02:32 EDT 2024. Contains 372572 sequences. (Running on oeis4.)