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A151644 Number of permutations of 4 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order. 2
0, 0, 1828, 21571984, 29066972368, 16938467955200, 6501926870387116, 1978065945844840160, 524378714083391626872, 127734445724723139679472, 29503552588857666326833140, 6587452899587031432766113392, 1439127765510353092008927027552, 310010313330353917185364216860320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..200

CROSSREFS

Column k=6 of A236463.

Sequence in context: A235073 A205921 A196895 * A031934 A020423 A031804

Adjacent sequences:  A151641 A151642 A151643 * A151645 A151646 A151647

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 29 2009

EXTENSIONS

Terms a(8) and beyond from Andrew Howroyd, May 06 2020

STATUS

approved

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Last modified August 8 20:44 EDT 2022. Contains 356016 sequences. (Running on oeis4.)