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.

A118988 Number of different values taken by the permanent of a symmetric real (+1,-1)-matrix of order n.

Original entry on oeis.org

1, 2, 2, 4, 7, 15, 20, 62, 190, 771, 2073
Offset: 0

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A006125 (number of symmetric real (+1,-1)-matrices of order (n-1)).

Extensions

a(8)-a(9) from Minfeng Wang, Jun 20 2024
a(0)=1 prepended by Alois P. Heinz, Jun 21 2024
a(10) from Minfeng Wang, Sep 21 2024

A118986 Number of different values taken by the permanent of a symmetric real (0,1)-matrix of order n.

Original entry on oeis.org

1, 2, 3, 6, 14, 46, 176, 908, 5802, 44053
Offset: 0

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A006125 (number of symmetric real (0,1)-matrices of order (n-1)).

Extensions

a(8) from Minfeng Wang, Jun 12 2024
a(0)=1 prepended by Alois P. Heinz, Jun 12 2024
a(9) from Minfeng Wang, Jun 18 2024

A118985 Number of different values taken by the determinant of a symmetric real (0,1)-matrix of order n.

Original entry on oeis.org

1, 2, 3, 5, 7, 11, 19, 40, 91, 214, 577
Offset: 0

Views

Author

Giovanni Resta, May 08 2006

Keywords

Crossrefs

Cf. A006125 (number of symmetric real (0,1)-matrices of order (n-1)).

Extensions

a(0)=1 prepended by Alois P. Heinz, Mar 16 2019
a(8) from Minfeng Wang, Jun 11 2024
a(9) from Minfeng Wang, Jun 12 2024
a(10) from Hugo Pfoertner, Jun 25 2024
Showing 1-3 of 3 results.