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Number of connected triangle-free graphs on n nodes with chromatic number 4.
1

%I #12 Mar 05 2020 23:53:53

%S 0,0,0,0,0,0,0,0,0,0,1,23,1085,75127,6384013

%N Number of connected triangle-free graphs on n nodes with chromatic number 4.

%H Keith M. Briggs, <a href="http://keithbriggs.info/cgt.html">Combinatorial Graph Theory</a>

%Y See A116079 for further information.

%K nonn

%O 1,12

%A _N. J. A. Sloane_

%E a(15) from _Michael Sollami_, Feb 04 2012