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A177660
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, down, down, down, up, up
0
1, 70, 34650, 62484750, 297230343314, 3080473154954302, 61234390521656478875
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A177659
A177665
A177654
*
A177664
A177674
A177675
Adjacent sequences:
A177657
A177658
A177659
*
A177661
A177662
A177663
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 22 20:47 EDT 2024. Contains 375369 sequences. (Running on oeis4.)