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A177654
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down, down
0
1, 70, 34650, 62234190, 293951256700, 3019523592165814, 59424738039571181776
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177653
A177659
A177665
*
A177660
A177664
A177674
Adjacent sequences:
A177651
A177652
A177653
*
A177655
A177656
A177657
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 22 17:39 EDT 2024. Contains 375369 sequences. (Running on oeis4.)