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%I #25 Aug 03 2014 14:01:34
%S 2,50,12792,30844560
%N Number of nonsingular n X n matrices with elements from {0,1,2}.
%t (* 2x2 case *) cnt = 0; Do[d = Det[{{a, b}, {c, d}}]; If[d != 0, cnt++], {a, 0, 2}, {b, 0, 2}, {c, 0, 2}, {d, 0, 2}]; cnt (* _T. D. Noe_, Nov 29 2011 *)
%Y Cf. A055165, A056989.
%K nonn,more
%O 1,1
%A _Roger Hui_, Nov 29 2011
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