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A177643
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down
0
1, 60, 21524, 26227974, 81550349446, 541799718812754, 6819616215236462578
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A003794
A275051
A068295
*
A123482
A263606
A220371
Adjacent sequences:
A177640
A177641
A177642
*
A177644
A177645
A177646
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 23 15:20 EDT 2024. Contains 371916 sequences. (Running on oeis4.)