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%I #21 Nov 09 2022 07:54:59
%S 0,0,1,3,16,84,579,5721,87381,2104349,78315231,4383566676,362178638727
%N Number of 3-chromatic (i.e., chromatic number equals 3) simple graphs on n nodes.
%H Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a>
%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/n-ChromaticGraph.html">n-Chromatic Graph</a>
%Y Column k=3 of A084268.
%Y Cf. A076278, A076280, A076281, A076282, A115597.
%K nonn,more
%O 1,4
%A _Eric W. Weisstein_, Oct 06 2002
%E a(10) from _Keith Briggs_, Mar 14 2006
%E a(11) from _Michael Sollami_, Jan 28 2012
%E a(12)-a(13) from _Brendan McKay_, Nov 08 2022
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