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A151601 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order. 0
0, 3348, 20944448, 15679525340, 5314573995408, 1226608986189748 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

Sequence in context: A054356 A204884 A204880 * A203782 A206978 A206972

Adjacent sequences:  A151598 A151599 A151600 * A151602 A151603 A151604

KEYWORD

nonn

AUTHOR

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

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Last modified February 17 11:46 EST 2012. Contains 206011 sequences.