A177627 - OEIS

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A177627

Number of permutations of 3 copies of 1..n avoiding adjacent step pattern up, down, up, up, down, down

1, 20, 1665, 356520, 155809035, 121055807700, 152393963368875, 290740199232531840

(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: A094035 A177614 A177622 * A177620 A177632 A177631

Adjacent sequences: A177624 A177625 A177626 * A177628 A177629 A177630

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved