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, 11640, 10421120, 2396959400, 324776205024, 34107115135800

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