%I
%S 0,0,0,0,1,13,207,5128
%N Number of simple connected toroidal graphs on n nodes.
%C a(n) <= A145270(n).
%C a(n) = A145270(n) for n < 8.
%C a(8) = A145270(8)  15 since there are 15 doubletoroidal graphs on 8 nodes, all of which are connected.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ConnectedGraph.html">Connected Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/SimpleGraph.html">Simple Graph</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ToroidalGraph.html">Toroidal Graph</a>
%Y Cf. A145270 (simple connected nonplanar graphs).
%K nonn,more
%O 1,6
%A _Eric W. Weisstein_, Sep 10 2018
