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A076321 Number of 9-colorable (i.e., chromatic number <= 9) simple graphs on n nodes. 8
1, 2, 4, 11, 34, 156, 1044, 12346, 274668, 12005167, 1018997853 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Eric Weisstein's World of Mathematics, n-Colorable Graph
FORMULA
a(n) = A076320(n) + A205568(n). - Andrew Howroyd, Dec 02 2018
CROSSREFS
Cf. A000088. [R. J. Mathar, Sep 21 2008]
Sequence in context: A076319 A178944 A076320 * A000088 A071794 A234006
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Oct 06 2002
EXTENSIONS
a(10)-a(11) from Andrew Howroyd, Dec 02 2018
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)