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A151585
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.
1
0, 3, 976, 44275, 1046556, 18098871, 262962368, 3438697635, 42050013500
OFFSET
2,2
CROSSREFS
Sequence in context: A167058 A167067 A324443 * A286525 A030250 A145231
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved