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A084283 Number of connected labeled 3-colorable (i.e., chromatic number <= 3) graphs on n nodes. 4
1, 1, 4, 37, 667, 21886, 1262719, 125387767, 21009091072, 5809425721381, 2596693747042999, 1844571022305443422 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

LINKS

Table of n, a(n) for n=1..12.

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

FORMULA

Logarithmic transform of A084279. - Andrew Howroyd, Dec 02 2018

CROSSREFS

Cf. A001832, A084273, A084279, A084283, A084284, A084285, A084286.

Sequence in context: A155926 A094408 A061683 * A163880 A183509 A220245

Adjacent sequences:  A084280 A084281 A084282 * A084284 A084285 A084286

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, May 25 2003

EXTENSIONS

a(7)-a(12) from Andrew Howroyd, Dec 02 2018

STATUS

approved

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Last modified July 28 19:12 EDT 2021. Contains 346335 sequences. (Running on oeis4.)