A215620 - OEIS

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A215620

Numbers of apex graphs (graphs which become or remain planar upon the removal of a single vertex) on n vertices.

1, 2, 4, 11, 34, 155, 1026, 11666, 226916, 6810525 (list; graph; refs; listen; history; text; internal format)

	OFFSET	`1,2`
	COMMENTS	`Trivially includes planar graphs.`
	LINKS	`Table of n, a(n) for n=1..10.` `Eric Weisstein's World of Mathematics, Apex Graph`
	CROSSREFS	`Cf. A215621 (nonplanar apex graphs).` `Sequence in context: A217043 A249696 A156809 * A076317 A076318 A046750` `Adjacent sequences: A215617 A215618 A215619 * A215621 A215622 A215623`
	KEYWORD	`nonn,more`
	AUTHOR	`Eric W. Weisstein, Aug 17 2012`
	EXTENSIONS	`a(10) from Eric W. Weisstein, Aug 20 2012`
	STATUS	`approved`

Last modified April 16 12:45 EDT 2021. Contains 343037 sequences. (Running on oeis4.)