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 1-4 of 4 results.

A118996 Number of real n X n symmetric (0,1) matrices with negative determinant.

Original entry on oeis.org

0, 3, 27, 190, 4410, 753592, 127793708, 21893984392, 9100020369720, 16451259308386616
Offset: 1

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A086899, A086900, A086906, A118997, A118998, A118999, A119006.

Formula

a(n) = A086899(n) - A086900(n) = 2^(n*(n+1)/2) - A086906(n) - A086900(n). - Max Alekseyev, Jun 12 2025

Extensions

a(8)-a(10) from Max Alekseyev, Jun 17 2025

A118998 Minimal determinant of real n X n symmetric (0,1) matrices.

Original entry on oeis.org

0, -1, -2, -3, -5, -9, -32, -56, -128, -320
Offset: 1

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A119006, A119002, A118986, A118996, A119001, A119007.

Extensions

a(8)-a(10) from Max Alekseyev, Jun 17 2025

A119007 Number of n X n real symmetric (+1,-1)-matrices having minimal determinant (=A119000(n)).

Original entry on oeis.org

1, 4, 16, 16, 416, 10240, 161280, 645120, 15482880, 402554880
Offset: 1

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A119000, A119003, A119005, A119006.

Extensions

a(8)-a(10) from Max Alekseyev, Jun 17 2025

A119004 Number of n X n real symmetric (0,1)-matrices having maximal determinant (=A119002(n)).

Original entry on oeis.org

1, 1, 1, 18, 160, 900, 2520, 36960, 393120, 15573600
Offset: 1

Views

Author

Giovanni Resta, May 08 2006

Keywords

Links

Crossrefs

Cf. A051752, A119002, A119005, A119006.

Extensions

a(8)-a(10) from Max Alekseyev, Jun 17 2025
Showing 1-4 of 4 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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