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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.

A118987 Number of different values taken by the determinant of a symmetric real (+1,-1)-matrix of order n.

Original entry on oeis.org

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

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Author

Giovanni Resta, May 08 2006

Keywords

Links

Crossrefs

Cf. A089472, A118988, A118985.
Cf. A006125 (number of symmetric real (+1,-1)-matrices of order (n-1)).

Extensions

a(0)=1 prepended by Alois P. Heinz, Mar 16 2019
a(8) from Minfeng Wang, Jun 10 2024
a(9)-a(10) from Minfeng Wang, Jun 12 2024

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