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A177667
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up
0
1, 70, 33395, 56878758, 252566336705, 2426875246270330, 44531120457328688514
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177645
A177662
A177669
*
A177650
A177655
A177663
Adjacent sequences:
A177664
A177665
A177666
*
A177668
A177669
A177670
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 22 20:23 EDT 2024. Contains 375369 sequences. (Running on oeis4.)