OFFSET
1,8
COMMENTS
A diagonal of triangle in A126736.
LINKS
Travis Hoppe and Anna Petrone, Encyclopedia of Finite Graphs
T. Hoppe and A. Petrone, Integer sequence discovery from small graphs, arXiv preprint arXiv:1408.3644 [math.CO], 2014.
F. Hüffner, tinygraph, software for generating integer sequences based on graph properties.
Eric Weisstein's World of Mathematics, Chromatic Number
CROSSREFS
KEYWORD
nonn,hard,more
AUTHOR
Travis Hoppe and Anna Petrone, Apr 27 2014
EXTENSIONS
a(11) added using tinygraph by Falk Hüffner, Apr 04 2017
STATUS
approved