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A151643 Number of permutations of 4 indistinguishable copies of 1..n with exactly 5 adjacent element pairs in decreasing order. 2
0, 0, 8464, 15018688, 6501577152, 1585757994496, 290861341616496, 45679059507623040, 6563622028755987104, 895009629522636673728, 118277136569294999638992, 15337783893522951844828992, 1966328218272794506172178816, 250347808250994150312231611520 (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=5 of A236463.

Sequence in context: A170787 A237846 A232907 * A031590 A322160 A253499

Adjacent sequences:  A151640 A151641 A151642 * A151644 A151645 A151646

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 June 22 21:29 EDT 2021. Contains 345393 sequences. (Running on oeis4.)