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A151580 Number of permutations of 1..n arranged in a circle with exactly 7 adjacent element pairs in decreasing order. 2
0, 8, 2223, 146080, 5007112, 116857368, 2112659718, 31852408056, 419567641380, 4982201574576, 54527214028669, 559001753070984, 5433944411838700, 50558500037520720, 453570522365097900, 3946487691743226960, 33461385366044612088, 277535329177185004536 (list; graph; refs; listen; history; text; internal format)
OFFSET
7,2
LINKS
Andrew Howroyd, Table of n, a(n) for n = 7..500
FORMULA
a(n) = n*A001243(n-1). - Andrew Howroyd, May 05 2020
CROSSREFS
Column k=7 of A334218.
Cf. A001243.
Sequence in context: A302380 A303101 A302952 * A173175 A268150 A325062
Adjacent sequences: A151577 A151578 A151579 * A151581 A151582 A151583
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 21 2009
EXTENSIONS
Terms a(16) and beyond from Andrew Howroyd, May 05 2020
STATUS
approved

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Last modified May 17 19:53 EDT 2024. Contains 372607 sequences. (Running on oeis4.)