A151586 Number of permutations of 2 indistinguishable copies of 1..n arranged in a circle with exactly 5 adjacent element pairs in decreasing order.

0, 184, 41450, 2698344, 101727276, 2846840080, 66502921806, 1382518990400

Offset

3,2

Links

Table of n, a(n) for n=3..10.

Crossrefs

Sequence in context: A094631 A060491 A203843 * A194614 A232915 A139265

Adjacent sequences: A151583 A151584 A151585 * A151587 A151588 A151589

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved