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A151634 Number of permutations of 3 indistinguishable copies of 1..n with exactly 4 adjacent element pairs in decreasing order. 0
0, 405, 128124, 12750255, 789300477, 38464072830, 1641724670475 (list; graph; refs; listen; history; internal format)
OFFSET

2,2

CROSSREFS

Sequence in context: A204636 A187134 A185839 * A132362 A203944 A203937

Adjacent sequences:  A151631 A151632 A151633 * A151635 A151636 A151637

KEYWORD

nonn

AUTHOR

R. H. Hardin (rhhardin(AT)att.net) May 29 2009

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Last modified February 18 00:14 EST 2012. Contains 206085 sequences.