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A210283 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant n-1.

%I A210283 #9 Nov 25 2016 12:21:41
%S A210283 0,10,7,20,29,59,53,126,91,185,172,274,179,481,245,456,492,672,383,
%T A210283 948,479,1097,870,1030,669,1864,980,1376,1354,2017,1029,2768,1201,
%U A210283 2508,1984,2260,2090,4124,1667,2790,2682,4538,2009,5068,2243,4519
%N A210283 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant n-1.
%C A210283 See A210000 for a guide to related sequences.
%H A210283 Chai Wah Wu, <a href="/A210283/b210283.txt">Table of n, a(n) for n = 0..3000</a>
%t A210283 a = 0; b = n; z1 = 45;
%t A210283 t[n_] := t[n] = Flatten[Table[w*z - x*y, {w, a, b}, {x, a, b}, {y, a, b}, {z, a, b}]]
%t A210283 c[n_, k_] := c[n, k] = Count[t[n], k]
%t A210283 Table[c[n, n - 1], {n, 0, z1}]  (* A210283 *)
%Y A210283 Cf. A210000.
%K A210283 nonn
%O A210283 0,2
%A A210283 _Clark Kimberling_, Mar 19 2012