A272663 - OEIS

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A272663

Number of distinct characteristic polynomials of n X n matrices with elements {t, 1}, where t is an indeterminate.

1, 2, 9, 68, 1161

(list; graph; refs; listen; history; text; internal format)

OFFSET

0,2

REFERENCES

Robert M. Corless, Bohemian Eigenvalues, Talk Presented at Computational Discovery in Mathematics (ACMES 2), University of Western Ontario, May 12 2016. (Talk based on joint work with Steven E. Thornton, Sonia Gupta, Jonathan Brino-Tarasoff, Venkat Balasubramanian.)

LINKS

Table of n, a(n) for n=0..4.

CROSSREFS

Six classes of matrices mentioned in Rob Corless's talk: A272658, A272659, A272660, A272661, A272662, A272663.

Sequence in context: A354730 A193160 A255537 * A006849 A319285 A316652

Adjacent sequences: A272660 A272661 A272662 * A272664 A272665 A272666

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 15 2016

EXTENSIONS

a(0)=1 prepended by Alois P. Heinz, Sep 28 2023

STATUS

approved