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A084272 Number of labeled 4-chromatic (i.e., chromatic number = 4) graphs on n nodes. 2
0, 0, 0, 1, 65, 5042, 605545, 120653315, 40885736829, 23907349095479, 24391928745798217 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

LINKS

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

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

FORMULA

a(n) = A084280(n) - A084279(n). - Andrew Howroyd, Dec 02 2018

CROSSREFS

Cf. A084270, A084271, A084279, A084280.

Sequence in context: A078988 A027535 A110900 * A146756 A202386 A294955

Adjacent sequences:  A084269 A084270 A084271 * A084273 A084274 A084275

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, May 24 2003

EXTENSIONS

a(7)-a(11) from Andrew Howroyd, Dec 02 2018

STATUS

approved

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Last modified January 29 11:16 EST 2020. Contains 331337 sequences. (Running on oeis4.)