A306791 Number of distinct eigenvalues of n X n matrices with elements {-1, 1}.

2, 9, 35, 335, 7709, 510743

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: A185034 A185234 A357202 * A175231 A175261 A086556

Adjacent sequences: A306788 A306789 A306790 * A306792 A306793 A306794

Keyword

nonn,more,hard

Author

Steven E. Thornton, Mar 10 2019

Status

approved