A151581 Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order.

0, 9, 5020, 526240, 26441856, 862140162, 21078701112, 419567641380, 7160621079552, 108507581733075, 1496470017336660, 19127489390389332, 229712892700188480, 2619711824193741060, 28608047711740408560, 301155410573256748920, 3072652643940279427584

Offset: 8

Author

R. H. Hardin, May 21 2009

Keywords

• nonn

Links

• Andrew Howroyd, Table of n, a(n) for n = 8..500

Crossrefs

Column k=8 of A334218.

Cf. A001244.

Formula

a(n) = n*A001244(n-1). - Andrew Howroyd, May 05 2020

Extensions

Terms a(17) and beyond from Andrew Howroyd, May 05 2020