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.

A305571 Number of diagonal Latin squares of order n with at least one orthogonal diagonal mate.

Original entry on oeis.org

1, 0, 0, 48, 480, 0, 1290240, 25484820480, 34482663290880
Offset: 1

Views

Author

Eduard I. Vatutin, Jun 05 2018

Keywords

Crossrefs

Formula

a(n) = A305570(n) * n!.
a(n) = A274806(n) - A305569(n).

Extensions

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

A305568 Number of bachelor diagonal Latin squares of order n with the first row in ascending order.

Original entry on oeis.org

0, 0, 0, 0, 4, 128, 170944, 7446955776, 5056994558482608
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) = A305569(n) / n!.
a(n) = A274171(n) - A305570(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.