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A126738
Number of connected graphs on n nodes with chromatic number 4.
2
0, 0, 0, 1, 3, 26, 282, 5009, 149551, 7694428, 667036310
OFFSET
1,5
CROSSREFS
A diagonal of triangle in A126736.
Sequence in context: A048861 A053972 A204561 * A283298 A259610 A326396
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 16 2007
EXTENSIONS
a(11) from Michael Sollami, Jan 29 2012
STATUS
approved