%I #15 Sep 03 2019 19:50:35
%S 0,0,0,0,0,2,4,16,21,168
%N Number of weakly regular simple graphs on n nodes.
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/WeaklyRegularGraph.html">Weakly Regular Graph</a>
%F a(n) = A005176(n) - A076435(n). - _Andrew Howroyd_, Sep 03 2019
%Y Cf. A005176 (regular simple graphs on n nodes).
%Y Cf. A294405 (connected weakly regular graphs on n nodes).
%Y Cf. A076435 (strongly regular simple graphs on n nodes).
%K nonn,more
%O 1,6
%A _Eric W. Weisstein_, Oct 11 2002
%E a(10) from _Eric W. Weisstein_, Oct 30 2017