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A151594
Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
0
0, 3, 81808, 56283220, 12683975484, 1689235173192, 168235956902400
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OFFSET
2,2
LINKS
Table of n, a(n) for n=2..8.
CROSSREFS
Sequence in context:
A175551
A230719
A213000
*
A119119
A164841
A171366
Adjacent sequences:
A151591
A151592
A151593
*
A151595
A151596
A151597
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 21 2009
STATUS
approved
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Last modified August 18 13:06 EDT 2024. Contains 375269 sequences. (Running on oeis4.)