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A151587
Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
1
0, 4, 11565, 2580588, 229630758, 12719963448, 531411968223, 18510889687040
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OFFSET
3,2
LINKS
Table of n, a(n) for n=3..10.
CROSSREFS
Sequence in context:
A352497
A191592
A261821
*
A193137
A280545
A134368
Adjacent sequences:
A151584
A151585
A151586
*
A151588
A151589
A151590
KEYWORD
nonn
AUTHOR
R. H. Hardin
, May 21 2009
STATUS
approved
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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)