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A306794 Number of distinct real eigenvalues of n X n matrices with elements {-1, 1}. 0
2, 5, 15, 119, 2297, 145213 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..6.

S. E. Thornton, Properties of the Bohemian family of n x n matrices with population {-1, 1}, Characteristic Polynomial Database.

CROSSREFS

Number of distinct eigenvalues is in A306791.

Number of characteristic polynomials is in A272662.

Number of minimal polynomials is in A306782.

Sequence in context: A196196 A266573 A268121 * A111790 A309115 A248125

Adjacent sequences:  A306791 A306792 A306793 * A306795 A306796 A306797

KEYWORD

nonn,more,hard

AUTHOR

Steven E. Thornton, Mar 10 2019

STATUS

approved

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Last modified September 28 13:24 EDT 2020. Contains 337393 sequences. (Running on oeis4.)