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Number of weakly regular simple graphs on n nodes.
3

%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