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A151584 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order. 0
0, 36, 1088, 14220, 134928, 1093316, 8120064, 57280284, 391301840 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

Sequence in context: A180802 A184292 A000809 * A103278 A004294 A075760

Adjacent sequences:  A151581 A151582 A151583 * A151585 A151586 A151587

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) May 21 2009

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Last modified February 16 11:25 EST 2012. Contains 205907 sequences.