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A185136
Number of not necessarily connected 3-regular simple graphs on 2n vertices with girth exactly 6.
8
0, 0, 0, 0, 0, 0, 0, 1, 1, 5, 32, 385, 7573, 181224, 4624481, 122089999, 3328899592, 93988909792
OFFSET
0,10
FORMULA
a(n) = A006926(n) + A185036(n).
CROSSREFS
Not necessarily connected 3-regular simple graphs on 2n vertices with girth exactly g: A185130 (triangle); fixed g: A185133 (g=3), A185134 (g=4), A185135 (g=5), this sequence (g=6).
Sequence in context: A094653 A135250 A006926 * A014374 A185336 A125709
KEYWORD
nonn,hard,more
AUTHOR
Jason Kimberley, Mar 21 2012
STATUS
approved