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.

A351241 Denominator of the maximal sum of inverse squares of the singular values of symmetric Toeplitz anti-Hadamard matrices of order n.

Original entry on oeis.org

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 5, 1, 1, 8546700, 9763, 49
Offset: 1

Views

Author

Stefano Spezia, Feb 05 2022

Keywords

Links

Crossrefs

Cf. A005312, A005313, A351240 (numerator).

A351821 Maximal sum of inverse squares of the singular values of Toeplitz anti-Hadamard matrices of order n.

Original entry on oeis.org

1, 3, 7, 16, 46, 138, 601, 2619, 16162, 93531, 654700, 4442304
Offset: 1

Views

Author

Stefano Spezia, Feb 20 2022

Keywords

Links

Crossrefs

Cf. A005312, A005313, A351240, A351241.

Extensions

a(12) confirmed and inserted by Stefano Spezia, Mar 16 2022

A352177 a(n) is the number of symmetric Toeplitz anti-Hadamard matrices of order n whose sum of the inverse squares of their singular values is maximal.

Original entry on oeis.org

1, 2, 1, 2, 1, 3, 1, 1, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
Offset: 1

Views

Author

Stefano Spezia, Mar 08 2022

Keywords

Links

Crossrefs

Cf. A351240, A351241.
Cf. A005312, A005313, A351821, A351984.

Formula

Conjectures: (Start)
a(n) = 1 for n > 9.
G.f.: x*(x + x^3 + 2*x^5 + x^8 + 1/(1 - x)). (End)
Showing 1-3 of 3 results.

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

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