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A177572
Number of permutations of 2 copies of 1..n avoiding adjacent step pattern up, up, down, down, down
0
1, 6, 90, 2502, 111060, 7197358, 641227980, 75188708366, 11226009350064, 2079447834540540
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OFFSET
1,2
LINKS
Table of n, a(n) for n=1..10.
CROSSREFS
Sequence in context:
A177571
A177590
A177577
*
A177583
A177578
A177582
Adjacent sequences:
A177569
A177570
A177571
*
A177573
A177574
A177575
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 10 2010
STATUS
approved
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Last modified April 24 05:49 EDT 2024. Contains 371918 sequences. (Running on oeis4.)