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Number of connected graphs on n nodes with chromatic number 7.
2

%I #15 Apr 05 2017 05:13:51

%S 0,0,0,0,0,0,1,6,110,4125,389583

%N Number of connected graphs on n nodes with chromatic number 7.

%C A diagonal of triangle in A126736.

%H Travis Hoppe and Anna Petrone, <a href="https://github.com/thoppe/Encyclopedia-of-Finite-Graphs">Encyclopedia of Finite Graphs</a>

%H T. Hoppe and A. Petrone, <a href="http://arxiv.org/abs/1408.3644">Integer sequence discovery from small graphs</a>, arXiv preprint arXiv:1408.3644 [math.CO], 2014.

%H F. Hüffner, <a href="https://github.com/falk-hueffner/tinygraph">tinygraph</a>, software for generating integer sequences based on graph properties.

%H Eric Weisstein's World of Mathematics, <a href="http://mathworld.wolfram.com/ChromaticNumber.html">Chromatic Number</a>

%K nonn,hard,more

%O 1,8

%A _Travis Hoppe_ and _Anna Petrone_, Apr 27 2014

%E a(11) added using tinygraph by _Falk Hüffner_, Apr 04 2017