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%I M1302
%S 1,2,4,44,164,616
%N N-free graphs.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H P. J. Cameron, <a href="http://dx.doi.org/10.1093/qmath/38.2.155">Some treelike objects</a>, Quart. J. Math. Oxford, 38 (1987), 155-183.
%K nonn,nice,easy,more
%O 0,2
%A _N. J. A. Sloane_.
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