A205568 - OEIS

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A205568

Number of 9-chromatic (i.e., chromatic number equals 9) simple graphs on n nodes.

3

0, 0, 0, 0, 0, 0, 0, 0, 1, 9, 222

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,10

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=9 of A084268.

Cf. A076278, A076279, A076281, A076282.

Sequence in context: A368704 A205578 A221439 * A264848 A033632 A110260

Adjacent sequences: A205565 A205566 A205567 * A205569 A205570 A205571

KEYWORD

nonn,more

AUTHOR

Michael Sollami, Jan 28 2012

STATUS

approved