OFFSET
1,4
LINKS
Keith M. Briggs, Combinatorial Graph Theory
Eric Weisstein's World of Mathematics, n-Chromatic Graph
CROSSREFS
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Oct 06 2002
EXTENSIONS
a(10) from Keith Briggs, Mar 14 2006
a(11) from Michael Sollami, Jan 28 2012
a(12)-a(13) from Brendan McKay, Nov 08 2022
STATUS
approved