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A126751
Number of biconnected graphs on n nodes with chromatic number 3.
0
0, 0, 1, 1, 6, 30, 232, 2762, 50814, 1420183, 58836784
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,5
LINKS
Table of n, a(n) for n=1..11.
Keith M. Briggs, Combinatorial Graph Theory
CROSSREFS
A diagonal of triangle in A126749.
The sequence for "connected" is A126737.
Sequence in context: A208942 A209070 A259820 * A009689 A228873 A366809
Adjacent sequences: A126748 A126749 A126750 * A126752 A126753 A126754
KEYWORD
nonn,more
AUTHOR
N. J. A. Sloane, Feb 18 2007
EXTENSIONS
a(11) from Michael Sollami, Feb 18 2012
STATUS
approved

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Last modified September 28 07:39 EDT 2024. Contains 376288 sequences.
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