A177598 - OEIS

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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

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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) fromAlois P. Heinz,Nov 02 2013

STATUS

approved