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A271570 Number of distinct eigenvalues of n X n matrices with elements {-1, 0, +1}. 1
3, 21, 375, 24823 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

Steven E. Thornton & Robert M. Corless, The Bohemian Eigenvalue Project, Poster Presented at The International Symposium on Symbolic and Algebraic Computation (ISSAC 2016). Wilfrid Laurier University, July 19-22, 2016.

LINKS

Table of n, a(n) for n=1..4.

Steven E. Thornton, GitHub repository for code used to generate this sequence.

CROSSREFS

Number of characteristic polynomials: A272658.

Sequence in context: A186271 A101389 A108716 * A084620 A120603 A285380

Adjacent sequences:  A271567 A271568 A271569 * A271571 A271572 A271573

KEYWORD

nonn,more,hard

AUTHOR

Steven E. Thornton, Jul 13 2016

STATUS

approved

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Last modified October 21 00:56 EDT 2017. Contains 293679 sequences.