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A126737
Number of connected graphs on n nodes with chromatic number 3.
3
0, 0, 1, 2, 12, 64, 475, 5036, 80947, 2010328, 76115143
OFFSET
1,4
CROSSREFS
A diagonal of triangle in A126736.
Sequence in context: A162973 A321989 A226226 * A345697 A097632 A076804
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 16 2007
EXTENSIONS
a(11) from Michael Sollami, Jan 29 2012
STATUS
approved