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.

A364886 Number of n X n (-1, 1)-matrices which have only eigenvalues with strictly negative real part (which implies that the matrix has all nonzero eigenvalues).

Table of values

n a(n)
1 1
2 2
3 20
4 640
5 97824
6 47545088

List of values

[1, 2, 20, 640, 97824, 47545088]

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

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