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.

A305570 Number of diagonal Latin squares of order n with the first row in order and at least one orthogonal diagonal mate.

Original entry on oeis.org

1, 0, 0, 2, 4, 0, 256, 632064, 95024976
Offset: 1

Views

Author

Eduard I. Vatutin, Jun 05 2018

Keywords

Crossrefs

Formula

a(n) = A305571(n) / n!.
a(n) = A274171(n) - A305568(n).

Extensions

Name clarified by Andrew Howroyd, Oct 19 2020
a(9) added by Eduard I. Vatutin, Dec 22 2020

A305569 Number of bachelor diagonal Latin squares of order n.

Original entry on oeis.org

0, 0, 0, 0, 480, 92160, 861557760, 300261256888320, 1835082185382168791040
Offset: 1

Views

Author

Eduard I. Vatutin, Jun 05 2018

Keywords

Comments

A bachelor diagonal Latin square is one with no orthogonal mate.

Crossrefs

Formula

a(n) = A305568(n) * n!.
a(n) = A274806(n) - A305571(n).

Extensions

a(9) added by Eduard I. Vatutin, Dec 22 2020

A337309 Number of main classes of bachelor diagonal Latin squares of order n.

Original entry on oeis.org

0, 0, 0, 0, 1, 2, 967, 4871991, 3292326080087
Offset: 1

Views

Author

Eduard I. Vatutin, Aug 22 2020

Keywords

Comments

A bachelor diagonal Latin square is one with no orthogonal mate.

Crossrefs

Formula

a(n) = A287764(n) - A330391(n).

Extensions

a(9) added by Eduard I. Vatutin, Dec 08 2020
Showing 1-3 of 3 results.