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A151589
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.
1
0, 5, 105372, 92123514, 25367820672, 3777055329267
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OFFSET
4,2
LINKS
Table of n, a(n) for n=4..9.
CROSSREFS
Sequence in context:
A133381
A366270
A236066
*
A243114
A038027
A237641
Adjacent sequences:
A151586
A151587
A151588
*
A151590
A151591
A151592
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 21 2009
STATUS
approved
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Last modified August 18 23:05 EDT 2024. Contains 375284 sequences. (Running on oeis4.)