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A177645
Number of permutations of 4 copies of 1..n avoiding adjacent step pattern up, up, down, down
0
1, 70, 32988, 53577384, 223138602958, 1992266686369568, 33770993367805159464
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context:
A146499
A177649
A177651
*
A177662
A177669
A177667
Adjacent sequences:
A177642
A177643
A177644
*
A177646
A177647
A177648
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.)