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

%I #8 Mar 11 2019 04:11:24

%S 2,5,15,119,2297,145213

%N Number of distinct real eigenvalues of n X n matrices with elements {-1, 1}.

%H S. E. Thornton, <a href="http://www.bohemianmatrices.com/cpdb/unstructured/unstructured_n1_1">Properties of the Bohemian family of n x n matrices with population {-1, 1}</a>, Characteristic Polynomial Database.

%Y Number of distinct eigenvalues is in A306791.

%Y Number of characteristic polynomials is in A272662.

%Y Number of minimal polynomials is in A306782.

%K nonn,more,hard

%O 1,1

%A _Steven E. Thornton_, Mar 10 2019