login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A306791 Number of distinct eigenvalues of n X n matrices with elements {-1, 1}. 2
2, 9, 35, 335, 7709, 510743 (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 characteristic polynomials is in A272662.

Number of minimal polynomials is in A306782.

Sequence in context: A150966 A185034 A185234 * A175231 A175261 A086556

Adjacent sequences:  A306788 A306789 A306790 * A306792 A306793 A306794

KEYWORD

nonn,more,hard

AUTHOR

Steven E. Thornton, Mar 10 2019

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

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