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A126752
Number of biconnected graphs on n nodes with chromatic number 4.
0
0, 0, 0, 1, 2, 17, 189, 3627, 118114, 6530233, 596566067
OFFSET
1,5
COMMENTS
It is possible that the definition should say "connected" rather than "biconnected". Should be rechecked! - Max Alekseyev and Brendan McKay, Jun 17 2008
CROSSREFS
A diagonal of triangle in A126749.
Sequence in context: A199751 A348766 A367839 * A234461 A363495 A277768
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 18 2007
EXTENSIONS
a(11) from Michael Sollami, Feb 18 2012
STATUS
approved