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 A126977 #5 Jan 23 2013 10:59:05 %S A126977 2,9,12,36,6,1,3,4,18 %N A126977 A 3 x 3 multiplicative magic square read by rows. %C A126977 The magic product is 216. %H A126977 Wikipedia, <a href="http://en.wikipedia.org/wiki/Magic_square">Magic squares</a>. %e A126977 The magic square is: %e A126977 2 9 12 %e A126977 36 6 1 %e A126977 3 4 18 %Y A126977 Cf. A126651, A126652, A126653, A126654, A126709, A126710, A125519, A125522, A126275, A126276. %K A126977 fini,full,nonn,tabf %O A126977 1,1 %A A126977 _Parthasarathy Nambi_, Mar 20 2007