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 A235611 #6 May 19 2015 16:08:58 %S A235611 2,5,13,35,96,267,750,2118 %N A235611 First row of array in A235610. %H A235611 John Tromp, <a href="http://tromp.github.io/c4/c4.html">John's Connect Four Playground</a>, viewed Jan 23 2014. %Y A235611 Cf. A235610. %K A235611 nonn,more %O A235611 1,1 %A A235611 _N. J. A. Sloane_, Jan 23 2014