A076281 Number of 5-chromatic (i.e., chromatic number equals 5) simple graphs on n nodes.

0, 0, 0, 0, 1, 5, 52, 867, 28722, 1919895, 250530482

Offset

1,6

Links

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

Keith M. Briggs, Combinatorial Graph Theory

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

Crossrefs

Column k=5 of A084268.

Cf. A076278, A076279, A076280, A076282.

Sequence in context: A108459 A223898 A210096 * A099977 A274257 A336609

Adjacent sequences: A076278 A076279 A076280 * A076282 A076283 A076284

Keyword

nonn,more

Author

Eric W. Weisstein, Oct 06 2002

Extensions

a(10) from Keith Briggs, Mar 14 2006

a(11) from Michael Sollami, Jan 28 2012

Status

approved