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A177630
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, down, down, down, down.
0
1, 1, 20, 1680, 369600, 167895912, 136567215720, 180834782762247, 364064983677371040
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OFFSET
0,3
LINKS
Table of n, a(n) for n=0..8.
CROSSREFS
Cf.
A014606
.
Sequence in context:
A177606
A177617
A177629
*
A177294
A177615
A177616
Adjacent sequences:
A177627
A177628
A177629
*
A177631
A177632
A177633
KEYWORD
nonn
,
more
AUTHOR
R. H. Hardin
, May 10 2010
STATUS
approved
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Last modified April 25 06:49 EDT 2024. Contains 371964 sequences. (Running on oeis4.)