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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. 1
0, 36, 1088, 14220, 134928, 1093316, 8120064, 57280284, 391301840 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,2

LINKS

Table of n, a(n) for n=2..10.

CROSSREFS

Sequence in context: A184292 A225830 A000809 * A233085 A215858 A103278

Adjacent sequences:  A151581 A151582 A151583 * A151585 A151586 A151587

KEYWORD

nonn

AUTHOR

R. H. Hardin May 21 2009

STATUS

approved

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Last modified September 18 13:34 EDT 2020. Contains 337169 sequences. (Running on oeis4.)