A151594 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 6 adjacent element pairs in decreasing order.

0, 3, 81808, 56283220, 12683975484, 1689235173192, 168235956902400

Offset

2,2

Links

Table of n, a(n) for n=2..8.

Crossrefs

Sequence in context: A175551 A230719 A213000 * A119119 A164841 A171366

Adjacent sequences: A151591 A151592 A151593 * A151595 A151596 A151597

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved