A373915 -id:A373915 - cp's OEIS frontend

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

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

Offset: 0

Giovanni Resta, May 08 2006

Minfeng Wang, C++ program

Cf. A089472, A108150, A118987, A118986, A373915, A373916.

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

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

A373916 Numbers that are the determinant of real {0,1}-matrices of order 10, but not of symmetric such matrices.

Original entry on oeis.org

253, 268, 274, 294, 304

Offset: 1

Hugo Pfoertner, Jun 25 2024

This property also applies to the corresponding negative values.

William P. Orrick, Spectrum of the determinant function, (2010). The applicable part is "Spectrum for n=11" because of the representation for {-1,1}-matrices.
Hugo Pfoertner, Positions of the terms in a histogram of the accumulated occurrence counts.

Cf. A003432, A006125, A013588, A089472, A108150, A118985, A373915.

cp's OEIS Frontend

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

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