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A084284 Number of connected labeled 4-colorable (i.e., chromatic number <= 4) graphs on n nodes. 3
1, 1, 4, 38, 727, 26538, 1832900, 241187797, 60807843592, 29307734588670, 26725594885115575 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
Table of n, a(n) for n=1..11.
Eric Weisstein's World of Mathematics, n-Colorable Graph
FORMULA
Logarithmic transform of A084280. - Andrew Howroyd, Dec 02 2018
CROSSREFS
Cf. A001832, A084274, A084280, A084283, A084285, A084286.
Sequence in context: A171779 A171203 A096332 * A084285 A084286 A001187
Adjacent sequences: A084281 A084282 A084283 * A084285 A084286 A084287
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, May 25 2003
EXTENSIONS
a(7)-a(11) from Andrew Howroyd, Dec 02 2018
STATUS
approved

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Last modified June 1 12:42 EDT 2024. Contains 373023 sequences. (Running on oeis4.)