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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
OFFSET
1,2
CROSSREFS
Sequence in context: A094212 A070832 A170994 * A297573 A346566 A159730
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved