%I A107460
%S A107460 1,0,1,3,2,1,3,2,3,3,3,5,5,3,4,7,6,4,6,7,6,9,6,6,9,6,10,11,8,7,11,11,9,
%T A107460 13,9,11,14,9,10,15,12,12
%N A107460 Number of nonisomorphic bipartite generalized Petersen graphs P(2n,k) 
               with girth 8 on 4n vertices for 1<=k<n.
%C A107460 The generalized Petersen graph P(n,k) is a graph with vertex set $V(P(n,
               k)) = \{u_0,u_1,\dots,u_{n-1},v_0,v_1,\dots,v_{n-1}\}$ and edge set 
               $E(P(n,k)) = \{u_i u_{i+1}, u_i v_i, v_i v_{i+k} : i=0,\dots,n-1\},
               $ where the subscripts are to be read modulo $n$.
%D A107460 I. Z. Bouwer, W. W. Chernoff, B. Monson and Z. Star, The Foster Census 
               (Charles Babbage Research Centre, 1988), ISBN 0-919611-19-2.
%D A107460 M. Watkins, A theorem on Tait colorings with an application to the generalized 
               Petersen graphs, J. Combin. Theory 6 (1969), 152-164.
%H A107460 Marko Boben, Tomaz Pisanski, Arjana Zitnik, <a href="http://www.ijp.si/
               ftp/pub/preprints/ps/2004/pp939.ps">I-graphs and the corresponding 
               configurations</a>, Preprint series (University of Ljubljana, IMFM), 
               Vol. 42 (2004), 939 (ISSN 1318-4865).
%e A107460 A generalized Petersen graph P(n,k) is bipartite if and only if n is 
               even and k is odd; it has girth 8 if and only if it has girth more 
               than 6
%e A107460 The smallest bipartite generalized Petersen graph with girth 8 is P(18,
               5)
%Y A107460 Cf. A077105, A107452-A107459.
%Y A107460 Sequence in context: A138034 A087818 A112746 this_sequence A152975 A128262 
               A140414
%Y A107460 Adjacent sequences: A107457 A107458 A107459 this_sequence A107461 A107462 
               A107463
%K A107460 nonn
%O A107460 9,4
%A A107460 Marko Boben (Marko.Boben(AT)fmf.uni-lj.si), Tomaz Pisanski (Tomaz.Pisanski(AT)fmf.uni-lj.si) 
               and Arjana Zitnik (Arjana.Zitnik(AT)fmf.uni-lj.si), May 26 2005