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A076318 Number of 6-colorable (i.e., chromatic number <= 6) simple graphs on n nodes. 8
1, 2, 4, 11, 34, 156, 1043, 12338, 274541, 12000742, 1018595454 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..11.

Eric Weisstein's World of Mathematics, n-Colorable Graph

FORMULA

a(n) = A076317(n) + A076282(n). - Andrew Howroyd, Dec 02 2018

CROSSREFS

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

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 April 18 07:59 EDT 2021. Contains 343084 sequences. (Running on oeis4.)