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 A131752 #2 Mar 30 2012 17:21:00
%S A131752 1,2,4,7,10,16,24,36,56,76,112,160
%N A131752 Number of ways of choosing the largest subset of {1,2,...,n} such that no two distinct elements differ by a perfect square.
%Y A131752 Cf. A100719, A131753, A131754.
%K A131752 nonn
%O A131752 1,2
%A A131752 _Olivier Gérard_, Sep 17 2007