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 A124251 #3 Mar 30 2012 16:50:35 %S A124251 11,20,21,31,41,51,61,71,81,91,101,201,301,401,501,601,701,801,901,202 %N A124251 Another version of A124250. %D A124251 Harry Waldman, MAA is offered opportunity to buy a unique gold logo, FOCUS (Math. Assoc. Amer.), Vol. 26 (No. 9, 2006), p. 13. %Y A124251 See A124250 for further information. %K A124251 nonn,fini,full,unkn %O A124251 1,1 %A A124251 _N. J. A. Sloane_, based on email from T. D. Noe, Dec 15 2006