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A177673
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, up, down, down.
0
1, 70, 34290, 60635566, 281746189372, 2845828778331540, 55049107499751379058
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177655
A177663
A177668
*
A177661
A177672
A177299
Adjacent sequences:
A177670
A177671
A177672
*
A177674
A177675
A177676
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 10 2010
STATUS
approved
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Last modified March 29 02:15 EDT 2024. Contains 371264 sequences. (Running on oeis4.)