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A151587 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order. 0
0, 4, 11565, 2580588, 229630758, 12719963448, 531411968223, 18510889687040 (list; graph; refs; listen; history; internal format)
OFFSET

3,2

CROSSREFS

Sequence in context: A201392 A058417 A191592 * A193137 A134368 A152840

Adjacent sequences:  A151584 A151585 A151586 * A151588 A151589 A151590

KEYWORD

nonn

AUTHOR

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

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Last modified February 16 20:23 EST 2012. Contains 205962 sequences.