A084271 Number of labeled 3-chromatic (i.e., chromatic number = 3) graphs on n nodes.

0, 0, 1, 22, 582, 22377, 1353810, 134222308, 22133512793, 6025984082738, 2662612877308658, 1876486379430019037

Offset

1,4

Links

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

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

Formula

a(n) = A084279(n) - A047864(n). - Andrew Howroyd, Dec 02 2018

Crossrefs

Cf. A047864, A084270, A084272, A084279.

Sequence in context: A240369 A159875 A240337 * A092086 A369142 A218478

Adjacent sequences: A084268 A084269 A084270 * A084272 A084273 A084274

Keyword

nonn,more

Author

Eric W. Weisstein, May 24 2003

Extensions

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

Status

approved