login
A151605
Number of permutations of 5 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.
0
0, 40, 127260, 25681280, 2620321725, 205881818220
OFFSET
1,2
CROSSREFS
Sequence in context: A266157 A223103 A186166 * A253107 A300842 A159428
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved