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A177628
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, up
0
1, 20, 1635, 342601, 146163330, 110811673197, 136132704627644, 253516051052571276
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A250018
A177604
A177621
*
A177626
A177609
A094035
Adjacent sequences:
A177625
A177626
A177627
*
A177629
A177630
A177631
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified September 14 21:48 EDT 2024. Contains 375929 sequences. (Running on oeis4.)