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A210715
Number of disconnected regular simple graphs on n vertices with girth exactly 5.
1
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 6, 9, 9, 22, 13, 82, 18, 618, 26, 7164, 36, 107862, 50, 1876730, 70, 35924810, 95, 741405213, 131, 16356067216, 323, 383931367731, 132977
OFFSET
0,16
FORMULA
a(n) = A185215(n) - A185216(n).
CROSSREFS
Sequence in context: A078935 A276774 A129768 * A072926 A080087 A345163
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Dec 10 2012
STATUS
approved