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A177566
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down, down, up
0
1, 6, 90, 2478, 108087, 6858729, 597102395, 68327728061, 9947340852218, 1795593162877489
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177585
A177559
A177581
*
A177586
A177579
A177591
Adjacent sequences:
A177563
A177564
A177565
*
A177567
A177568
A177569
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified August 10 13:41 EDT 2024. Contains 375056 sequences. (Running on oeis4.)