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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.

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

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Author

Giovanni Resta, May 08 2006

Keywords

Links

Crossrefs

Cf. A087983, A118987, A118986.
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

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

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