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.

A330391 Number of main classes of diagonal Latin squares of order n with at least one orthogonal diagonal mate.

Original entry on oeis.org

1, 0, 0, 1, 1, 0, 5, 1105, 75307
Offset: 1

Views

Author

Eduard I. Vatutin, Feb 25 2020

Keywords

Crossrefs

Formula

a(n) = A287764(n) - A337309(n).

Extensions

a(9) added by Eduard I. Vatutin, Dec 12 2020

A339926 Number of pairs of orthogonal diagonal Latin squares of order n.

Original entry on oeis.org

1, 0, 0, 1152, 57600, 0, 8128512000, 2149984921190400, 44762708532894105600
Offset: 1

Views

Author

Eduard I. Vatutin, Dec 23 2020

Keywords

Crossrefs

Formula

a(n) = A287651(n) * (n!)^2.

A338250 Number of isomorphism classes of pairs of orthogonal diagonal Latin squares of order n.

Original entry on oeis.org

1, 0, 0, 1, 1, 0, 7, 4545, 291670
Offset: 1

Views

Author

Eduard I. Vatutin, Dec 22 2020

Keywords

Crossrefs

Showing 1-3 of 3 results.