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 A235612 #6 May 19 2015 16:08:58 %S A235612 5,18,58,179,537,1571,4587,13343 %N A235612 Second column of array in A235610. %H A235612 John Tromp, <a href="http://tromp.github.io/c4/c4.html">John's Connect Four Playground</a>, viewed Jan 23 2014. %Y A235612 Cf. A235610. %K A235612 nonn,more %O A235612 1,1 %A A235612 _N. J. A. Sloane_, Jan 23 2014