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 A135784 #7 Nov 09 2016 02:44:52
%S A135784 4,25,64,100,169,289,324,400,625,676,841,1024,1156,1369,1600,1681,
%T A135784 2025,2500,2704,2809,3364,3721,4225,4624,5184,5329,5476,6400,6724,
%U A135784 7225,7921,8100,9409,9604,10000,10201,10816,11236,11881,12769,13456,13689,14884
%N A135784 a(n) = A000404(n)^2.
%H A135784 G. C. Greubel, <a href="/A135784/b135784.txt">Table of n, a(n) for n = 1..1400</a>
%t A135784 nMax = 100; p := Floor[Sqrt[nMax - 1]]; Union[Flatten[Table[a^2 + b^2, {a, p}, {b, a, Floor[Sqrt[nMax - a^2]]}]]]^2 (* _G. C. Greubel_, Nov 09 2016 *)
%Y A135784 Cf. A000404, A060803, A135786, A135787, A135788.
%K A135784 nonn
%O A135784 1,1
%A A135784 _Artur Jasinski_, Nov 29 2007