login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A272663 Number of distinct characteristic polynomials of n X n matrices with elements {t, 1}, where t is an indeterminate. 6
2, 9, 68, 1161 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

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=1..4.

CROSSREFS

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

Sequence in context: A020563 A193160 A255537 * A006849 A319285 A316652

Adjacent sequences:  A272660 A272661 A272662 * A272664 A272665 A272666

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 15 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 18 19:38 EST 2020. Contains 331029 sequences. (Running on oeis4.)