A151592 Number of permutations of 3 indistinguishable copies of 1..n arranged in a circle with exactly 4 adjacent element pairs in decreasing order.

0, 612, 98736, 5299575, 185625504, 5286098790, 134617006656

Offset

2,2

Links

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

Crossrefs

Sequence in context: A356643 A022049 A107513 * A292036 A253434 A253441

Adjacent sequences: A151589 A151590 A151591 * A151593 A151594 A151595

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved