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Number of nilpotent n X n matrices with elements {-1, 0, 1}.
0

%I #6 Mar 12 2019 04:51:07

%S 1,9,481,148817,243782721

%N Number of nilpotent n X n matrices with elements {-1, 0, 1}.

%H S. E. Thornton, <a href="http://www.bohemianmatrices.com/cpdb/unstructured/unstructured_n1_0_1">Properties of the Bohemian family of n x n matrices with population {-1, 0, 1}</a>, Characteristic Polynomial Database.

%Y Number of characteristic polynomials is in A272658.

%Y Number of distinct eigenvalues is in A271570.

%K nonn,more,hard

%O 1,2

%A _Steven E. Thornton_, Mar 11 2019