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A126741
Number of connected triangle-free graphs on n nodes with chromatic number 4.
1
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 23, 1085, 75127, 6384013
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,12
LINKS
Table of n, a(n) for n=1..15.
Keith M. Briggs, Combinatorial Graph Theory
CROSSREFS
See A116079 for further information.
Sequence in context: A042015 A042012 A128404 * A273477 A202656 A367772
Adjacent sequences: A126738 A126739 A126740 * A126742 A126743 A126744
KEYWORD
nonn
AUTHOR
N. J. A. Sloane
EXTENSIONS
a(15) from Michael Sollami, Feb 04 2012
STATUS
approved

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Last modified September 28 13:00 EDT 2024. Contains 376297 sequences.
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