A185037 Number of disconnected 3-regular simple graphs on 2n vertices with girth exactly 7.

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

Links

Table of n, a(n) for n=0..31.

Jason Kimberley, Index of sequences counting disconnected k-regular simple graphs with girth exactly g

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

Adjacent sequences: A185034 A185035 A185036 * A185038 A185039 A185040

Keyword

nonn,more,hard

Author

Jason Kimberley, Feb 29 2012

Status

approved