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A151601
Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.
0
0, 3348, 20944448, 15679525340, 5314573995408, 1226608986189748
OFFSET
2,2
CROSSREFS
Sequence in context: A255731 A204884 A204880 * A251817 A216488 A203782
KEYWORD
nonn
AUTHOR
R. H. Hardin May 21 2009
STATUS
approved