A128238 - OEIS

A128238

Number of n-node (unlabeled) graphs with girth 5.

0, 0, 1, 2, 8, 26, 101, 396, 1744, 8531, 47803, 308086, 2300756, 19909540, 199365557 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`3,4`
	LINKS	`Table of n, a(n) for n=3..17.`
	PROG	`(NAUTY) geng -tfq $n \| countg -qg5 --ng # Martin Fuller, May 03 2015`
	CROSSREFS	`Cf. A128041, A128042, A128236-A128243.` `Sequence in context: A357221 A281345 A348240 * A110156 A295934 A187151` `Adjacent sequences: A128235 A128236 A128237 * A128239 A128240 A128241`
	KEYWORD	`nonn`
	AUTHOR	`Keith Briggs, May 05 2007`
	EXTENSIONS	`Corrected and extended by Martin Fuller, May 01 2015`
	STATUS	`approved`

Last modified February 3 17:00 EST 2023. Contains 360044 sequences. (Running on oeis4.)