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A151631 Number of permutations of 2 indistinguishable copies of 1..n with exactly 9 adjacent element pairs in decreasing order. 2
0, 0, 0, 0, 0, 716, 6030140, 6727188848, 2898916824320, 713977455470200, 121976270685699352, 16151017610840330800, 1776999565259831468176, 170177528415687895764196, 14652450038892876986833140, 1161079239300986084649361440, 86154881092488160155801056400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,6

LINKS

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

CROSSREFS

Column k=9 of A154283.

Sequence in context: A214237 A252467 A233629 * A183841 A332171 A220724

Adjacent sequences:  A151628 A151629 A151630 * A151632 A151633 A151634

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 29 2009

EXTENSIONS

Terms a(11) and beyond from Andrew Howroyd, May 06 2020

STATUS

approved

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Last modified August 18 16:18 EDT 2022. Contains 356215 sequences. (Running on oeis4.)