A151608 Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.

0, 400, 78900, 4232384, 164553580, 5706469776

Offset

1,2

Links

Table of n, a(n) for n=1..6.

Crossrefs

Sequence in context: A187051 A231288 A210262 * A022232 A151652 A197441

Adjacent sequences: A151605 A151606 A151607 * A151609 A151610 A151611

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved