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.

A145270 Number of simple connected nonplanar graphs on n nodes.

Original entry on oeis.org

0, 0, 0, 0, 0, 1, 13, 207, 5143, 189195, 10663766, 989251266, 163746458178, 50329965610911
Offset: 0

Views

Author

Eric W. Weisstein, Oct 05 2008

Keywords

Links

Crossrefs

Cf. A145269.

Formula

a(n) = A001349(n) - A003094(n).

Extensions

Edited by Max Alekseyev, Sep 18 2009
a(12) added by Max Alekseyev, Aug 17 2015
a(13) from Max Alekseyev, Feb 20 2025

A319114 Number of simple toroidal graphs on n nodes.

Original entry on oeis.org

0, 0, 0, 0, 1, 14, 222, 5365
Offset: 1

Views

Author

Eric W. Weisstein, Sep 10 2018

Keywords

Comments

a(n) <= A145269(n).
a(n) = A145269(n) for n < 8.
a(8) = A145269(8) - 15 since there are 15 double-toroidal graphs on 8 nodes (all of which are connected).

Links

Crossrefs

Cf. A145269 (number of nonplanar simple 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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