A177613 - OEIS

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A177613

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

1, 20, 1680, 365824, 163212800, 129754904960, 167412069509691, 327734823220485100

(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: A177612 A177618 A177624 * A177619 A177623 A177633

Adjacent sequences: A177610 A177611 A177612 * A177614 A177615 A177616

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved