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A207408
Number of connected triangle-free graphs on n nodes with edge chromatic number 3.
2
0, 0, 0, 1, 4, 12, 27, 84, 212, 694, 2105, 7354, 25469, 95631, 364957
OFFSET
1,5
CROSSREFS
Cf. A116079.
Sequence in context: A013697 A306055 A212522 * A366998 A064444 A072182
KEYWORD
nonn
AUTHOR
Michael Sollami, Feb 17 2012
STATUS
approved