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A186744 Number of connected regular simple graphs on n vertices with girth exactly 4. 2
0, 0, 0, 0, 1, 0, 1, 0, 3, 0, 8, 2, 34, 31, 330, 1607, 17970, 193906, 2867269, 32674056, 1581626328, 6705889815 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,9

LINKS

Table of n, a(n) for n=0..21.

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

FORMULA

a(n) = A186724(n) - A186725(n).

CROSSREFS

Sequence in context: A197416 A197512 A232272 * A200507 A296042 A180661

Adjacent sequences:  A186741 A186742 A186743 * A186745 A186746 A186747

KEYWORD

nonn,more,hard

AUTHOR

Jason Kimberley, Apr 03 2012

STATUS

approved

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Last modified February 17 23:35 EST 2020. Contains 332006 sequences. (Running on oeis4.)