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 1-3 of 3 results.

A094087 Domination number of the Cartesian product of two n-cycles.

Original entry on oeis.org

1, 2, 3, 4, 5, 8, 12, 16, 18, 20, 27, 32, 38, 42, 45, 56, 64, 71, 76, 80, 95, 104, 114, 120, 125, 144, 155
Offset: 1

Views

Author

Richard Bean, May 01 2004

Keywords

Comments

1/5 <= a(n)/n^2 <= 1/4 for n >= 4; it is conjectured that a(5n-1) = 5*n^2 - n and a(5n+1) = 5n^2 + 4n - 1 for n >= 1. - Richard Bean, Sep 08 2006 [Assadian proves that the both conjectured formulas give the upper bounds. - Andrey Zabolotskiy, Dec 23 2019]
The Cartesian product of two cycles is also called the torus grid graph. - Andrew Howroyd, Feb 29 2020

Crossrefs

Formula

a(5n) = 5n^2. - Richard Bean, Jun 08 2006

Extensions

More terms from Richard Bean, Sep 08 2006
a(22) from Richard Bean, Jul 24 2018
a(23)-a(24) from Shao et al. added by Andrey Zabolotskiy, Dec 23 2019
a(25)-a(27) from Richard Bean, Apr 03 2022

A303210 Number of total dominating sets in the n X n torus grid graph.

Original entry on oeis.org

334, 33489, 11343461, 14511093444, 67561889987621, 1157220349268282289
Offset: 3

Views

Author

Eric W. Weisstein, Apr 19 2018

Keywords

Crossrefs

Extensions

a(6)-a(8) from Andrew Howroyd, Apr 21 2018

A303213 Number of minimum total dominating sets in the n X n torus grid graph.

Original entry on oeis.org

6, 16, 400, 324, 28, 144, 7452, 2500, 44, 784
Offset: 3

Views

Author

Eric W. Weisstein, Apr 19 2018

Keywords

Crossrefs

Extensions

a(6)-a(8) from Andrew Howroyd, Apr 21 2018
a(9)-a(10) from Eric W. Weisstein, Mar 31 2025
a(11)-a(12) from Eric W. Weisstein, Apr 04 2025
Showing 1-3 of 3 results.