A177610 - OEIS

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A177610

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

1, 20, 1596, 320048, 129324340, 92116698310, 105699012290844, 183051978088671332

(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: A177625 A203481 A177608 * A130040 A331563 A250018

Adjacent sequences: A177607 A177608 A177609 * A177611 A177612 A177613

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 10 2010

STATUS

approved