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 A174083 Number of circular permutations of length n with no consecutive triples (i, i+d, i+2d) (mod n) for all d. 3
 4, 0, 40, 168, 1652, 9408, 117896, 1019260, 12737856, 140794368 (list; graph; refs; listen; history; text; internal format)
 OFFSET 4,1 COMMENTS Circular permutations are permutations whose indices are from the ring of integers modulo n. LINKS Table of n, a(n) for n=4..13. EXAMPLE For n=5 since a(5)=0 all (5-1)! = 24 circular permutations of length 5 have some consecutive triple (i, i+d, i+2d) (mod 5). For example, the permutation (0,4,2,1,3) has a triple (1,3,0) with d=2. This is clearly a special case. CROSSREFS Cf. A165962, A174075, A174080, A174081, A174082. Sequence in context: A270184 A271300 A271120 * A123936 A271834 A138546 Adjacent sequences: A174080 A174081 A174082 * A174084 A174085 A174086 KEYWORD nonn,more AUTHOR Isaac Lambert, Mar 15 2010 EXTENSIONS a(10)-a(13) from Andrey Goder, Jul 03 2022 STATUS approved

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Last modified September 23 15:35 EDT 2023. Contains 365554 sequences. (Running on oeis4.)