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Number of 3-connected bipartite graphs on n unlabeled nodes.
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%I #7 Jan 17 2020 03:30:25

%S 1,1,6,12,85,471,5373,75145,1543382,41554738

%N Number of 3-connected bipartite graphs on n unlabeled nodes.

%e a(6) = 1 because the complete bipartite graph K_{3,3} is the only 3-connected bipartite graph on 6 vertices.

%Y Cf. A005142.

%K nonn,more

%O 6,3

%A _Gordon F. Royle_, May 10 2007