A177588 - OEIS

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A177588

Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, up, up, up

1, 6, 90, 2520, 113160, 7441949, 674077493, 80453033424, 12236281595093, 2310183602289482

(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: A177564 A177565 A177576 * A177589 A177285 A177574

Adjacent sequences: A177585 A177586 A177587 * A177589 A177590 A177591

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved