login
A215620
Numbers of apex graphs (graphs which become or remain planar upon the removal of a single vertex) on n vertices.
2
1, 2, 4, 11, 34, 155, 1026, 11666, 226916, 6810525
OFFSET
1,2
COMMENTS
Trivially includes planar graphs.
LINKS
Eric Weisstein's World of Mathematics, Apex Graph
CROSSREFS
Cf. A215621 (nonplanar apex graphs).
Cf. A076317 (number of 5-colorable simple graphs on n nodes).
Sequence in context: A217043 A249696 A156809 * A076317 A076318 A046750
KEYWORD
nonn,more
AUTHOR
Eric W. Weisstein, Aug 17 2012
EXTENSIONS
a(10) from Eric W. Weisstein, Aug 20 2012
STATUS
approved