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A177591
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, down, up, down, down
0
1, 6, 90, 2482, 109476, 7045740, 623113066, 72495993816, 10736006696280, 1971973147757382
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177566
A177586
A177579
*
A177571
A177590
A177577
Adjacent sequences:
A177588
A177589
A177590
*
A177592
A177593
A177594
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified June 12 21:26 EDT 2024. Contains 373360 sequences. (Running on oeis4.)
