

A185037


Number of disconnected 3regular 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
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OFFSET

0,26


LINKS

Table of n, a(n) for n=0..31.
Jason Kimberley, Index of sequences counting disconnected kregular simple graphs with girth exactly g


FORMULA

a(n) = A185237(n)  A185238(n).


CROSSREFS

Disconnected 3regular 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
Adjacent sequences: A185034 A185035 A185036 * A185038 A185039 A185040


KEYWORD

nonn,more,hard


AUTHOR

Jason Kimberley, Feb 29 2012


STATUS

approved



