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 A047684 #10 Jan 02 2016 14:02:35 %S A047684 1,2,9,126,13596,108096891 %N A047684 Number of reduced contexts on n unlabeled objects. %C A047684 Equivalently, number of closure systems on n points, up to isomorphism. %D A047684 Bernhard Ganter, Rudolf Wille: Formal Concept Analysis, Springer-Verlag, 1999, ISBN 3-540-62771-5, p. 59. %K A047684 hard,nonn,nice %O A047684 1,2 %A A047684 Bernhard Ganter (ganter(AT)math.tu-dresden.de) %E A047684 a(6) from _Klaus Hoffmann_, Jan 01 2016