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 A102778 #4 Mar 30 2012 16:50:10 %S A102778 1,1,-1,-5,1,7,-1,-68,1,1,-12,228,-1,-15,-770,-1,1,2460,-5166,-1, %T A102778 -135762627,63,-266,5,1,-175,27728847,-1,-19535516,-15,-3,-11,52,-1, %U A102778 -9762340,-77,-4,-1812880,1,5,-3,-46129720,9,-3003037440 %N A102778 Values of x arising from representations of -n in A102535. %H A102778 Allan J. MacLeod, <a href="http://maths.paisley.ac.uk/allanm/ecrnt/knight/knintro.htm">Knight's Problem</a> %K A102778 sign %O A102778 1,4 %A A102778 _N. J. A. Sloane_, Mar 17 2005