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A177598
Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up.
0
1, 15, 767, 93621, 22431655, 9362799454, 6260161965339, 6298506200484865, 9087853319185940117, 18101094912700638755191
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context: A199227 A055683 A196465 * A333562 A116094 A267754
Adjacent sequences: A177595 A177596 A177597 * A177599 A177600 A177601
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 10 2010
EXTENSIONS
a(9)-a(10) from Alois P. Heinz, Nov 02 2013
STATUS
approved

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Last modified November 7 02:29 EST 2024. Contains 377523 sequences.
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