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A151594
Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
0
0, 3, 81808, 56283220, 12683975484, 1689235173192, 168235956902400
OFFSET
2,2
CROSSREFS
Sequence in context: A175551 A230719 A213000 * A119119 A164841 A171366
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved