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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 (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) = A076315(n) + A076280(n). - Andrew Howroyd, Dec 02 2018

CROSSREFS

Cf. A033995, A076280, A076315, A076317, A076318, A076319, A076320, A076321.

Sequence in context: A123470 A123450 A052431 * A304125 A082104 A198634

Adjacent sequences:  A076313 A076314 A076315 * A076317 A076318 A076319

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 May 16 12:46 EDT 2021. Contains 343947 sequences. (Running on oeis4.)