

A272660


Number of distinct characteristic polynomials of n X n matrices with elements {t, 1, 2} where t is an indeterminate.


6




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 BrinoTarasoff, 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



