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A174079 Number of circular permutations of length n with no consecutive triples i,i+2,i+4 (mod n) or i,i-2,i-4 (mod n). 3
12, 84, 494, 3696, 30574 (list; graph; refs; listen; history; text; internal format)
OFFSET

5,1

COMMENTS

Circular permutations are permutations whose indices are from the ring of integers modulo n.

LINKS

Table of n, a(n) for n=5..9.

EXAMPLE

For n=5 there are (5-1)!-a(5)=12 circular permutations with triples i,i+2,i+4 (mod 5) or triples i,i-2,i-4 (mod 5). An example of one is (0,3,1,2,4) because of the progression 0,3,1 (mod 5).

CROSSREFS

Cf. A078628, A174076, A174077, A174078.

Sequence in context: A004407 A054849 A000761 * A003209 A155645 A336907

Adjacent sequences:  A174076 A174077 A174078 * A174080 A174081 A174082

KEYWORD

nonn

AUTHOR

Isaac Lambert, Mar 10 2010

STATUS

approved

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Last modified September 28 10:48 EDT 2021. Contains 347714 sequences. (Running on oeis4.)