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A177582
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, down, down, up, up, up
0
1, 6, 90, 2510, 112020, 7307874, 655845094, 77496572328, 11662893335890, 2177988280932500
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177572
A177583
A177578
*
A177592
A177593
A132467
Adjacent sequences:
A177579
A177580
A177581
*
A177583
A177584
A177585
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 25 06:14 EDT 2024. Contains 371964 sequences. (Running on oeis4.)