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A151629 Number of permutations of 2 indistinguishable copies of 1..n with exactly 7 adjacent element pairs in decreasing order. 2
0, 0, 0, 0, 232, 450048, 163809288, 27306899520, 2898916824320, 230479103253264, 15045786224718576, 853790829031070016, 43726349865720132216, 2073954076439134340896, 92786533933117718314680, 3968339124661862533557120, 163867469809854783921566544 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

CROSSREFS

Column k=7 of A154283.

Sequence in context: A125850 A139673 A252003 * A301828 A132917 A139652

Adjacent sequences:  A151626 A151627 A151628 * A151630 A151631 A151632

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 April 22 14:00 EDT 2021. Contains 343177 sequences. (Running on oeis4.)