OFFSET
0,4
LINKS
Eric Weisstein's World of Mathematics, Chromatic Invariant
Eric Weisstein's World of Mathematics, Triangular Grid Graph
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Nov 16 2017
EXTENSIONS
a(8)-a(11) from Andrew Howroyd, Apr 23 2018
STATUS
approved