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 A124523 #8 Dec 30 2012 12:23:48 %S A124523 1,3,8,20,49,119,289,707,1749,4379,11092,28412,73573,192535,508918, %T A124523 1357770,3653343,9905437,27040975,74269569,205091177,569078255, %U A124523 1585839062,4436191950,12452408525,35062157207,99000292173,280242836387,795124827781,2260758570327 %N A124523 Binomial transform of A084239. %K A124523 nonn %O A124523 0,2 %A A124523 _N. J. A. Sloane_, Jul 11 2008