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A177602 Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, down 0
1, 18, 1200, 196544, 64274760, 36903349792, 34074227986704, 47451264308831568 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
CROSSREFS
Sequence in context: A064564 A152933 A360602 * A252969 A182286 A292609
KEYWORD
nonn
AUTHOR
R. H. Hardin May 10 2010
STATUS
approved

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Last modified March 29 05:48 EDT 2024. Contains 371265 sequences. (Running on oeis4.)