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A177609 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, up 0
1, 20, 1644, 343010, 144972862, 108488657665, 131237713050591, 240253621967060451 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A177621 A177628 A177626 * A094035 A177614 A177622
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)