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A177650
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, up, up
0
1, 70, 33607, 56904056, 249804639258, 2365851085271034, 42713565749790262494
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177662
A177669
A177667
*
A177655
A177663
A177668
Adjacent sequences:
A177647
A177648
A177649
*
A177651
A177652
A177653
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 22 23:25 EDT 2024. Contains 375369 sequences. (Running on oeis4.)