cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

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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.

Original entry on oeis.org

1, 2, 4, 11, 34, 155, 1026, 11666, 226916, 6810525
Offset: 1

Views

Author

Eric W. Weisstein, Aug 17 2012

Keywords

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).

Extensions

a(10) from Eric W. Weisstein, Aug 20 2012
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Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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