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A177631 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, up, down, down, up, up 0
1, 20, 1674, 363454, 161958230, 128735444262, 166178950132409, 325628012566801867 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context: A177627 A177620 A177632 * A177292 A266737 A177599
Adjacent sequences: A177628 A177629 A177630 * A177632 A177633 A177634
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved

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Last modified June 12 14:38 EDT 2024. Contains 373331 sequences. (Running on oeis4.)