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A177623 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up 0
1, 20, 1680, 367262, 165022063, 132375585604, 172527174986381, 341425620652837589 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A177624 A177613 A177619 * A177633 A177634 A177293
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved

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Last modified April 27 21:23 EDT 2024. Contains 372020 sequences. (Running on oeis4.)