A084272 -id:A084272 - cp's OEIS frontend

A084270 Number of labeled 2-chromatic (i.e., chromatic number = 2) graphs on n nodes.

0, 1, 6, 40, 375, 5176, 103236, 2922445, 116011230, 6433447396, 498234407451, 54007795331920, 8213123246906760, 1756336596363006841, 528975889250504033526, 224688018516023267969440, 134708289561117007261966815

Offset: 1

Eric W. Weisstein, May 24 2003

nonn

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

Cf. A084271, A084272.

a(n) = A047864(n)-1. - Vladeta Jovovic, Jul 31 2003

More terms from Vladeta Jovovic, Jul 31 2003

One further term from David Wasserman, Dec 13 2004

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

Original entry on oeis.org

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

Offset: 1

Eric W. Weisstein, May 24 2003

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

Cf. A047864, A084270, A084272, A084279.

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

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

cp's OEIS Frontend

A084270 Number of labeled 2-chromatic (i.e., chromatic number = 2) graphs on n nodes.

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