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A151581 Number of permutations of 1..n arranged in a circle with exactly 8 adjacent element pairs in decreasing order. 2
0, 9, 5020, 526240, 26441856, 862140162, 21078701112, 419567641380, 7160621079552, 108507581733075, 1496470017336660, 19127489390389332, 229712892700188480, 2619711824193741060, 28608047711740408560, 301155410573256748920, 3072652643940279427584 (list; graph; refs; listen; history; text; internal format)
OFFSET
8,2
LINKS
FORMULA
a(n) = n*A001244(n-1). - Andrew Howroyd, May 05 2020
CROSSREFS
Column k=8 of A334218.
Cf. A001244.
Sequence in context: A323337 A167064 A125541 * A145263 A185821 A133248
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 21 2009
EXTENSIONS
Terms a(17) and beyond from Andrew Howroyd, May 05 2020
STATUS
approved

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Last modified June 24 03:36 EDT 2024. Contains 373661 sequences. (Running on oeis4.)