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A177565
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down, down, down
0
1, 6, 90, 2520, 112920, 7398873, 667165914, 79232435816, 11987084051880, 2250732641346600
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177284
A266735
A177564
*
A177576
A177588
A177589
Adjacent sequences:
A177562
A177563
A177564
*
A177566
A177567
A177568
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified June 7 14:59 EDT 2024. Contains 373202 sequences. (Running on oeis4.)
