%I A076281
%S A076281 0,0,0,0,1,5,52,867,28722,1919895
%N A076281 Number of 5-chromatic (i.e. chromatic number equals 5) simple graphs 
               on n nodes.
%H A076281 Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial 
               Graph Theory</a>
%H A076281 Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/
               n-ChromaticGraph.html">n-Chromatic Graph</a>
%Y A076281 Cf. A076278, A076279, A076280, A076282.
%Y A076281 Sequence in context: A071583 A099881 A108459 this_sequence A099977 A001173 
               A107803
%Y A076281 Adjacent sequences: A076278 A076279 A076280 this_sequence A076282 A076283 
               A076284
%K A076281 nonn,more
%O A076281 1,6
%A A076281 Eric Weisstein (eric(AT)weisstein.com), Oct 06, 2002
%E A076281 a(10) from Keith Briggs, Mar 14 2006.