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A151599
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.
0
0, 2, 13485, 2273540, 167274075, 8894295174, 406137173897
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..7.
CROSSREFS
Sequence in context: A094212 A070832 A170994 * A297573 A346566 A159730
Adjacent sequences: A151596 A151597 A151598 * A151600 A151601 A151602
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved

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Last modified September 28 17:16 EDT 2024. Contains 376297 sequences.
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