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A177585
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, up, down, up, up
0
1, 6, 90, 2446, 105516, 6624618, 570683441, 64611629712, 9304151482673, 1660908411640448
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177558
A177580
A177587
*
A177559
A177581
A177566
Adjacent sequences:
A177582
A177583
A177584
*
A177586
A177587
A177588
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 24 22:17 EDT 2024. Contains 371964 sequences. (Running on oeis4.)