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A076316
Number of 4-colorable (i.e., chromatic number <= 4) simple graphs on n nodes.
9
1, 2, 4, 11, 33, 150, 985, 11390, 243791, 9965456, 753402410
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, n-Colorable Graph
FORMULA
a(n) = A076315(n) + A076280(n). - Andrew Howroyd, Dec 02 2018
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Oct 06 2002
EXTENSIONS
a(10)-a(11) from Andrew Howroyd, Dec 02 2018
STATUS
approved