A128239 - OEIS

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A128239

Number of n-node (unlabeled) graphs with girth 6.

3

0, 0, 0, 1, 2, 9, 28, 107, 376, 1457, 5733, 24385, 110240, 540400, 2867847

(list; graph; refs; listen; history; text; internal format)

OFFSET

3,5

LINKS

Table of n, a(n) for n=3..17.

PROG

(nauty) geng -tfq $n | countg -qg6 --ng # Martin Fuller, May 03 2015

CROSSREFS

Cf. A128041, A128042, A128236-A128243.

Sequence in context: A002532 A360023 A098518 * A307400 A323682 A086511

Adjacent sequences: A128236 A128237 A128238 * A128240 A128241 A128242

KEYWORD

nonn,more

AUTHOR

Keith Briggs, May 05 2007

EXTENSIONS

Corrected and extended by Martin Fuller, May 01 2015

STATUS

approved