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A210716
Number of disconnected regular simple graphs on n vertices with girth exactly 6.
1
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 6, 6, 8, 9, 12, 12, 17, 17, 27, 24, 66, 32, 472, 44, 8172, 60, 191325, 80, 4856015, 107, 127937980, 143, 3482858430, 188, 98176518479, 248
OFFSET
0,19
FORMULA
a(n) = A185216(n) - A185217(n).
CROSSREFS
Sequence in context: A185326 A238209 A342096 * A027190 A036824 A108104
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Dec 10 2012
STATUS
approved