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A177666 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, down 0
1, 68, 31212, 50966304, 217643900486, 2016891757663928, 35773214436504563352 (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: A307137 A230685 A093234 * A292607 A211311 A203757

Adjacent sequences:  A177663 A177664 A177665 * A177667 A177668 A177669

KEYWORD

nonn

AUTHOR

R. H. Hardin May 10 2010

STATUS

approved

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Last modified August 7 19:57 EDT 2020. Contains 336279 sequences. (Running on oeis4.)