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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
OFFSET
1,12
CROSSREFS
See A116079 for further information.
Sequence in context: A042015 A042012 A128404 * A273477 A202656 A367772
KEYWORD
nonn
EXTENSIONS
a(15) from Michael Sollami, Feb 04 2012
STATUS
approved