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A151628 Number of permutations of 2 indistinguishable copies of 1..n with exactly 6 adjacent element pairs in decreasing order. 2
0, 0, 0, 1, 5158, 1822014, 242384856, 19323413187, 1130781824398, 54076536713976, 2251621794635088, 84973986733001061, 2985450779006443846, 99474230412387811666, 3185003930126491696920, 98939258210106714816135, 3003063241991742340646382, 89537653738976723063722828 (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=6 of A154283.

Sequence in context: A213701 A224462 A251679 * A210400 A073585 A249841

Adjacent sequences:  A151625 A151626 A151627 * A151629 A151630 A151631

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 14:03 EDT 2021. Contains 343177 sequences. (Running on oeis4.)