login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A076280 Number of 4-chromatic (i.e., chromatic number equals 4) simple graphs on n nodes. 10
0, 0, 0, 1, 4, 31, 318, 5366, 155291, 7855628, 675054876 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

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=4 of A084268.

Cf. A076278, A076279, A076281, A076282.

Sequence in context: A199683 A114475 A243312 * A141005 A122400 A107725

Adjacent sequences:  A076277 A076278 A076279 * A076281 A076282 A076283

KEYWORD

nonn,more

AUTHOR

Eric W. Weisstein, Oct 06 2002

EXTENSIONS

a(10) from Keith Briggs, Feb 24 2006

a(11) from Michael Sollami, Jan 28 2012

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 6 20:37 EST 2021. Contains 341850 sequences. (Running on oeis4.)