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A177661 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, down, down 0
1, 70, 34302, 60601152, 281381782044, 2841788674410678, 54998505166544652117 (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: A177663 A177668 A177673 * A177672 A177299 A266740

Adjacent sequences:  A177658 A177659 A177660 * A177662 A177663 A177664

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved

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Last modified April 18 22:08 EDT 2019. Contains 322237 sequences. (Running on oeis4.)