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%I #4 Sep 27 2017 15:07:31
%S 2,3,18,35219
%N Number of independent vertex sets and vertex covers in the n-permutation star graph.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/IndependentVertexSet.html">Independent Vertex Set</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/PermutationStarGraph.html">Permutation Star Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/VertexCover.html">Vertex Cover</a>
%K nonn,more
%O 1,1
%A _Eric W. Weisstein_, Sep 27 2017