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%I #6 Mar 12 2019 04:50:59
%S 0,4,0,2064,0,100172800
%N Number of nilpotent 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 characteristic polynomials is in A272662.
%Y Number of distinct eigenvalues is in A306791.
%K nonn,more,hard
%O 1,2
%A _Steven E. Thornton_, Mar 11 2019
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