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A076318
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Number of 6-colorable (i.e., chromatic number <= 6) simple graphs on n nodes.
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8
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1, 2, 4, 11, 34, 156, 1043, 12338, 274541, 12000742, 1018595454
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..11.
Eric Weisstein's World of Mathematics, n-Colorable Graph
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FORMULA
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a(n) = A076317(n) + A076282(n). - Andrew Howroyd, Dec 02 2018
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CROSSREFS
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Cf. A033995, A076282, A076315, A076316, A076317, A076319, A076320, A076321.
Sequence in context: A156809 A215620 A076317 * A046750 A076319 A178944
Adjacent sequences: A076315 A076316 A076317 * A076319 A076320 A076321
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KEYWORD
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nonn,more
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AUTHOR
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Eric W. Weisstein, Oct 06 2002
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EXTENSIONS
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a(10)-a(11) from Andrew Howroyd, Dec 02 2018
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STATUS
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approved
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