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A177636 Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down. 0
1, 26, 2506, 624446, 322530466, 301458657626, 465560613932206, 1112284734271280846 (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: A103642 A201623 A087616 * A232159 A263946 A172010

Adjacent sequences:  A177633 A177634 A177635 * A177637 A177638 A177639

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 10 2010

EXTENSIONS

a(8) from Alois P. Heinz, Oct 22 2013

STATUS

approved

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Last modified March 28 20:44 EDT 2020. Contains 333103 sequences. (Running on oeis4.)