A177625 - OEIS

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A177625

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

1, 20, 1572, 320232, 132684888, 97774021472, 116814354490224, 211630469311857952

(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: A200900 A177603 A160308 * A203481 A177608 A177610

Adjacent sequences: A177622 A177623 A177624 * A177626 A177627 A177628

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved