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 A059740 #1 May 16 2003 03:00:00 %S A059740 1,0,1,2,3,0,12,40,100,0,1225,6460,28812,0,1037232,9779616 %N A059740 Erroneous version of A005160. %H A059740 D. P. Robbins, Symmetry classes of alternating sign matrices, <a href="http://arXiv.org/abs/math.CO/0008045">arXiv:math.CO/0008045</a> %K A059740 dead %O A059740 1,4