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A151627 Number of permutations of 2 indistinguishable copies of 1..n with exactly 5 adjacent element pairs in decreasing order. 2
0, 0, 0, 72, 27664, 2864328, 163809288, 6727188848, 225167210712, 6590156148912, 175992170793456, 4407169187423736, 105396936343707456, 2437638848729751736, 55010494951127561400, 1219075824289276443744, 26652917330108137129544, 576864003740129587504224 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,4

LINKS

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

CROSSREFS

Column k=5 of A154283.

Sequence in context: A246633 A157459 A159393 * A223124 A062076 A284866

Adjacent sequences:  A151624 A151625 A151626 * A151628 A151629 A151630

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 23 05:16 EDT 2021. Contains 343199 sequences. (Running on oeis4.)