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A210713
Number of disconnected regular simple graphs on n vertices with girth exactly 3.
6
0, 0, 0, 0, 0, 0, 1, 1, 2, 2, 5, 4, 16, 13, 64, 98, 597, 2064, 22472, 112814, 4799607, 31138903, 4207941575, 115979716284, 13482672620149
OFFSET
0,9
FORMULA
a(n) = A068932(n) - A185214(n).
CROSSREFS
This sequence is the row sum sequence of the triangle A210703.
Disconnected k-regular simple graphs with girth exactly 3: this sequence (any k), A210703 (triangle); for fixed k: A185033 (k=3), A185043 (k=4), A185053 (k=5), A185063 (k=6).
Sequence in context: A284686 A349451 A054079 * A283825 A005177 A357123
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Apr 02 2012
STATUS
approved