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A151588
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
1
0, 760, 911520, 222334560, 25996425216, 1996732745784, 117482611237280
OFFSET
4,2
CROSSREFS
Sequence in context: A151633 A022051 A107515 * A141144 A139664 A160033
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved