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%I #8 Sep 27 2022 12:26:24
%S 1,2,4,11,33,148,906,8887,136755,3269254
%N Number of preperfect graphs on n nodes.
%H S. Hougardy, <a href="http://www.or.uni-bonn.de/~hougardy/">Home Page</a>
%H S. Hougardy, <a href="https://doi.org/10.1016/j.disc.2006.05.021">Classes of perfect graphs</a>, Discr. Math. 306 (2006), 2529-2571.
%K nonn,more
%O 1,2
%A _N. J. A. Sloane_, Oct 18 2006
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