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 A303582 #4 May 13 2018 08:58:22 %S A303582 22,55,178,206,260 %N A303582 Van der Waerden numbers W(5,n). %D A303582 Knuth, Donald E., Satisfiability, Fascicle 6, volume 4 of The Art of Computer Programming. Addison-Wesley, 2015, page 5. %Y A303582 Cf. A171181, A007784, A303583. %K A303582 nonn,more %O A303582 3,1 %A A303582 _N. J. A. Sloane_, May 13 2018