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A151586 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order. 0
0, 184, 41450, 2698344, 101727276, 2846840080, 66502921806, 1382518990400 (list; graph; refs; listen; history; text; internal format)
OFFSET

3,2

LINKS

Table of n, a(n) for n=3..10.

CROSSREFS

Sequence in context: A094631 A060491 A203843 * A194614 A232915 A139265

Adjacent sequences:  A151583 A151584 A151585 * A151587 A151588 A151589

KEYWORD

nonn

AUTHOR

R. H. Hardin May 21 2009

STATUS

approved

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Last modified January 20 19:53 EST 2020. Contains 331096 sequences. (Running on oeis4.)