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A126728
Number of graphs on n nodes with edge chromatic number 2.
1
0, 0, 1, 3, 5, 10, 15, 26, 37, 58
OFFSET
1,4
CROSSREFS
A diagonal of triangle in A123962.
Sequence in context: A074968 A308826 A090491 * A070557 A225751 A264397
KEYWORD
nonn
AUTHOR
N. J. A. Sloane, Feb 16 2007
STATUS
approved