%I #23 Oct 25 2020 08:57:36
%S 1,2,4,11,33,142,776,5699,50723,524572,6037518,75912033,1029974969,
%T 14974215412
%N Number of permutation perfect graphs on n nodes.
%C All permutation graphs are perfect. - _Jakub Jablonski_, Sep 07 2020
%H S. Hougardy, <a href="http://www.or.uni-bonn.de/~hougardy/">Home Page</a>
%H S. Hougardy, <a href="http://dx.doi.org/10.1016/j.disc.2006.05.021">Classes of perfect graphs</a>, Discr. Math. 306 (2006), 2529-2571.
%K nonn,more,hard
%O 1,2
%A _N. J. A. Sloane_, Oct 18 2006
%E a(11) from _Jakub Jablonski_, Sep 07 2020
%E a(12)-a(14) from _Tom Johnston_, Oct 25 2020