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 A216723 #3 Sep 15 2012 13:47:04 %S A216723 0,0,5,18,84,568,4122,33910 %N A216723 Second column of A216722. %D A216723 Wayne M. Dymacek, Isaac Lambert and Kyle Parsons, Arithmetic Progressions in Permutations, http://math.ku.edu/~ilambert/CN.pdf, 2012. %Y A216723 Cf. A216722, A165962. %K A216723 nonn %O A216723 3,3 %A A216723 _N. J. A. Sloane_, Sep 15 2012