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.

Showing 1-2 of 2 results.

A145269 Number of simple nonplanar graphs on n nodes.

Original entry on oeis.org

0, 0, 0, 0, 0, 1, 14, 222, 5380, 194815, 10864252, 1000316856, 164757860141
Offset: 0

Views

Author

Eric W. Weisstein, Oct 05 2008

Keywords

Links

  • Slavik Jablan, Ljiljana Radovic, Radmila Sazdanovic (2011). Nonplanar graphs derived from Gauss codes of virtual knots and links, J. Math. Chem. 49(10), 2250-2267, DOI:10.1007/s10910-011-9884-6
  • Eric Weisstein's World of Mathematics, Nonplanar Graph

Crossrefs

Cf. A145270.

Formula

a(n) = A000088(n) - A005470(n).

Extensions

Edited by Max Alekseyev, Sep 18 2009
a(12) added by Max Alekseyev, Aug 17 2015

A319115 Number of simple connected toroidal graphs on n nodes.

Original entry on oeis.org

0, 0, 0, 0, 1, 13, 207, 5128
Offset: 1

Views

Author

Eric W. Weisstein, Sep 10 2018

Keywords

Comments

a(n) <= A145270(n).
a(n) = A145270(n) for n < 8.
a(8) = A145270(8) - 15 since there are 15 double-toroidal graphs on 8 nodes, all of which are connected.

Links

Crossrefs

Cf. A145270 (simple connected nonplanar graphs).
Showing 1-2 of 2 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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