A151602 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order.

0, 264, 19386752, 51689441800, 44408699858208, 22152650667809256

Offset

2,2

Links

Table of n, a(n) for n=2..7.

Crossrefs

Sequence in context: A289745 A289639 A283665 * A345595 A345854 A051976

Adjacent sequences: A151599 A151600 A151601 * A151603 A151604 A151605

Keyword

nonn

Author

R. H. Hardin, May 21 2009

Status

approved