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 A102809 #3 Mar 30 2012 16:50:10 %S A102809 -6,-12,10,105,-20,-154,15,4403,-40,-30,364,-4921,21,440,24339,33,-42, %T A102809 -101639,272510,28,5003773320,-2736,19866,-230,-56,25312,-3712351475, %U A102809 36,1171388655,740,156,1100,-4277,45,551048889,4554,228 %N A102809 Values of z arising from representations of -n in A102535. %H A102809 Allan J. MacLeod, <a href="http://maths.paisley.ac.uk/allanm/ecrnt/knight/knintro.htm">Knight's Problem</a> %K A102809 sign %O A102809 1,1 %A A102809 _N. J. A. Sloane_, Mar 17 2005