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A151646 Number of permutations of 4 indistinguishable copies of 1..n with exactly 8 adjacent element pairs in decreasing order. 2
0, 0, 1, 4961755, 93200908410, 342907451401150, 580563155365559991, 636819836268006188325, 536414785137072299859000, 381545916738691833553696960, 242640958318176281706165559005, 143034343946525950106468425526767, 80029528286823033581035280235294534 (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=8 of A236463.

Sequence in context: A244266 A222976 A157804 * A210318 A227155 A106785

Adjacent sequences:  A151643 A151644 A151645 * A151647 A151648 A151649

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 May 16 10:20 EDT 2021. Contains 343940 sequences. (Running on oeis4.)