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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
OFFSET
3,2
CROSSREFS
Sequence in context: A352497 A191592 A261821 * A193137 A280545 A134368
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 21 2009
STATUS
approved