A151609 Number of permutations of 6 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.

0, 300, 753975, 188612400, 26312329155, 2954839555836

Offset

1,2

Links

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

Crossrefs

Sequence in context: A294687 A015275 A051306 * A004225 A004226 A297913

Adjacent sequences: A151606 A151607 A151608 * A151610 A151611 A151612

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved