A151598 Number of permutations of 4 indistinguishable copies of 1..n arranged in a circle with exactly 3 adjacent element pairs in decreasing order.

0, 24, 5292, 191920, 4441300, 86631624, 1564073084

Offset

1,2

Links

Table of n, a(n) for n=1..7.

Crossrefs

Sequence in context: A007241 A106207 A100089 * A003787 A002555 A239898

Adjacent sequences: A151595 A151596 A151597 * A151599 A151600 A151601

Keyword

nonn

Author

R. H. Hardin May 21 2009

Status

approved