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A076315 Number of 3-colorable (i.e., chromatic number <= 3) simple graphs on n nodes. 10
1, 2, 4, 10, 29, 119, 667, 6024, 88500, 2109828, 78347534, 4383817811, 362181166439 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
LINKS
Table of n, a(n) for n=1..13.
Eric Weisstein's World of Mathematics, n-Colorable Graph
FORMULA
a(n) = A033995(n) + A076279(n). - Andrew Howroyd, Dec 02 2018
CROSSREFS
Cf. A033995, A076279, A076316, A076317, A076318, A076319, A076320, A076321.
Sequence in context: A271077 A365903 A126349 * A304124 A229905 A361791
Adjacent sequences: A076312 A076313 A076314 * A076316 A076317 A076318
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Oct 06 2002
EXTENSIONS
a(10)-a(11) from Andrew Howroyd, Dec 02 2018
a(12) from Brendan McKay, Jan 19 2020
a(13) from Brendan McKay, Nov 08 2022
STATUS
approved

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Last modified May 25 09:23 EDT 2024. Contains 372786 sequences. (Running on oeis4.)