login
A185037
Number of disconnected 3-regular simple graphs on 2n vertices with girth exactly 7.
4
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 3, 27, 609, 32237, 1885410, 101214661, 5025320937
OFFSET
0,26
FORMULA
a(n) = A185237(n) - A185238(n).
CROSSREFS
Disconnected 3-regular simple graphs with girth exactly g: A185033 (g=3), A185034 (g=4), A185035 (g=5), A185036 (g=6), this sequence (g=7).
Sequence in context: A062496 A222844 A219345 * A185237 A099084 A085656
KEYWORD
nonn,more,hard
AUTHOR
Jason Kimberley, Feb 29 2012
STATUS
approved