This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A210366 #7 Jan 14 2017 01:37:10
%S A210366 1,3,18,61,168,368,749,1310,2235,3493,5291,7640,10869,14711,19860,
%T A210366 26051,33623,42618,53725,66280,81577,98739,118847,141800,168435,
%U A210366 197406,231100,268595,310617,356763,409136,465231,528830,597397,673127
%N A210366 Number of 2 X 2 matrices with all elements in {0,1,...,n} and determinant >=n.
%C A210366 See A210000 for a guide to related sequences.
%t A210366 a = 0; b = n; z1 = 45;
%t A210366 t[n_] := t[n] = Flatten[Table[w*z - x*y, {w, a, b}, {x, a, b}, {y, a, b}, {z, a, b}]]
%t A210366 c[n_, k_] := c[n, k] = Count[t[n], k]
%t A210366 c1[n_, m_] := c1[n, m] = Sum[c[n, k], {k, 0, m}]
%t A210366 Table[c1[n, n^2] - c1[n, n - 1], {n, 0, z1}](* A210366 *)
%Y A210366 Cf. A210000.
%K A210366 nonn
%O A210366 0,2
%A A210366 _Clark Kimberling_, Mar 20 2012