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A151606
Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
0
0, 2, 268128, 256405004, 82725015630, 17440046568756
OFFSET
1,2
CROSSREFS
Sequence in context: A228001 A202867 A058435 * A176939 A070694 A322095
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved