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A151588
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.
1
0, 760, 911520, 222334560, 25996425216, 1996732745784, 117482611237280
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OFFSET
4,2
LINKS
Table of n, a(n) for n=4..10.
CROSSREFS
Sequence in context:
A151633
A022051
A107515
*
A141144
A139664
A160033
Adjacent sequences:
A151585
A151586
A151587
*
A151589
A151590
A151591
KEYWORD
nonn
AUTHOR
R. H. Hardin
May 21 2009
STATUS
approved
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Last modified April 25 10:01 EDT 2024. Contains 371967 sequences. (Running on oeis4.)