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%I #13 May 27 2024 06:50:23
%S 2,40,6960,10340736,129599358720,13527918439695360
%N Number of unimodular 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.
%H Minfeng Wang, <a href="/A306839/a306839.cpp.txt">C++ program to calculate A306839</a>
%K nonn,more,hard
%O 1,1
%A _Steven E. Thornton_, Mar 12 2019
%E a(1)-a(5) confirmed and a(6) added by _Minfeng Wang_, May 01 2024