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%I #8 Mar 13 2019 02:43:13
%S 1,31,6891,12202161,175419087483
%N Number of singular n X n matrices with elements {0, 1, 2}.
%H S. E. Thornton, <a href="http://www.bohemianmatrices.com/cpdb/unstructured/unstructured_0_1_2">Properties of the Bohemian family of n x n matrices with population {0, 1, 2}</a>, Characteristic Polynomial Database.
%Y Number of non-singular matrices is in A197487.
%K nonn,more,hard
%O 1,2
%A _Steven E. Thornton_, Mar 12 2019
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