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A272660 Number of distinct characteristic polynomials of n X n matrices with elements {t, 1, 2} where t is an indeterminate. 6
3, 36, 1782 (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..3.

CROSSREFS

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

Sequence in context: A265475 A233197 A300770 * A193302 A289315 A102579

Adjacent sequences:  A272657 A272658 A272659 * A272661 A272662 A272663

KEYWORD

nonn,more

AUTHOR

N. J. A. Sloane, May 15 2016

STATUS

approved

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Last modified January 20 08:07 EST 2020. Contains 331081 sequences. (Running on oeis4.)