A177663 - OEIS

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A177663

Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, down

1, 70, 34052, 59177576, 268686190790, 2643357374211756, 49707855255794171208

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

LINKS

Table of n, a(n) for n=1..7.

CROSSREFS

Sequence in context: A177667 A177650 A177655 * A177668 A177673 A177661

Adjacent sequences: A177660 A177661 A177662 * A177664 A177665 A177666

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved