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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
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..8.
CROSSREFS
Sequence in context:
A363990
A201623
A087616
*
A232159
A263946
A358164
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 July 19 06:32 EDT 2024. Contains 374389 sequences. (Running on oeis4.)