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A151600
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.
0
0, 11640, 10421120, 2396959400, 324776205024, 34107115135800
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OFFSET
2,2
LINKS
Table of n, a(n) for n=2..7.
CROSSREFS
Sequence in context:
A250242
A231321
A154053
*
A214804
A352330
A203821
Adjacent sequences:
A151597
A151598
A151599
*
A151601
A151602
A151603
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 21 2009
STATUS
approved
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Last modified August 22 18:34 EDT 2024. Contains 375369 sequences. (Running on oeis4.)