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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.
8
1, 3, 36, 1782
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.)
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
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