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A107455 Number of nonisomorphic generalized Petersen graphs P(n,k) with girth 6 on n vertices for 1<=k<=Floor[(n-1)/2]. 0
1, 0, 1, 1, 1, 1, 2, 0, 2, 1, 2, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3, 1, 2, 1, 2, 1, 3 (list; graph; refs; listen; history; text; internal format)
OFFSET

8,7

COMMENTS

The generalized Petersen graph P(n,k) is a graph with vertex set V(P(n,k)) = {u_0,u_1,...,u_{n-1},v_0,v_1,...,v_{n-1}} and edge set E(P(n,k)) = {u_i u_{i+1}, u_i v_i, v_i v_{i+k} : i=0,...,n-1}, where the subscripts are to be read modulo n.

REFERENCES

I. Z. Bouwer, W. W. Chernoff, B. Monson and Z. Star, The Foster Census (Charles Babbage Research Centre, 1988), ISBN 0-919611-19-2.

LINKS

Table of n, a(n) for n=8..96.

Marko Boben, Tomaz Pisanski, Arjana Zitnik, I-graphs and the corresponding configurations, Preprint series (University of Ljubljana, IMFM), Vol. 42 (2004), 939 (ISSN 1318-4865).

M. Watkins, A theorem on Tait colorings with an application to the generalized Petersen graphs, J. Combin. Theory 6 (1969), 152-164.

EXAMPLE

A generalized Petersen graph P(n,k) has girth 6 if and only if it has girth more than 5 and (n=6k or k=3 or 2k=n-2 or 3k=n+1 or 3k=n-1)

The smallest generalized Petersen graph with girth 6 is P(8,3)

CROSSREFS

Cf. A077105, A107452-A107460.

Sequence in context: A238417 A117929 A306439 * A039701 A025822 A051585

Adjacent sequences:  A107452 A107453 A107454 * A107456 A107457 A107458

KEYWORD

nonn

AUTHOR

Marko Boben (Marko.Boben(AT)fmf.uni-lj.si), Tomaz Pisanski and Arjana Zitnik (Arjana.Zitnik(AT)fmf.uni-lj.si), May 26 2005

STATUS

approved

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Last modified July 31 04:01 EDT 2021. Contains 346367 sequences. (Running on oeis4.)